[Location map of Kidwell's Meadows in the Potomac River estuary, Washington D.C.].

Covers marsh which later became part of West Potomac Park.

Effect of chlorination on human enteric viruses in partially treated water from the Potomac River estuary : study report /

At head of cover title: Northeastern United States Water Supply Study.

Map of Jackson City opposite the city of Washington at the south end of the Potomac Free Bridge.

Shows proposed town of Jackson City in Alexandria County D.C.

Copy from actual survey of the 3 Sisters : [Potomac River, Washington D.C.] /

Cadastral map.

[A survey of a plot in Lancaster and Northumberland counties bounded by the Chesapeake Bay, Rappahnnock River, and the Potomac River ] /

Relief shown by hachures.

Min River Estuary, Fujian Sheng, China, 1749 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de la baye d'Hocsieu et des entrées de la riviere de Chang situées dans la province de Fokyen : tirées de manuscrits hollandois, J.V. Schley direx. It was published by Pierre de Hondt in 1749. Scale [ca. 1:270,000]. Covers the Minjiang Kou region, China. Map in French and Dutch.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Asia North Lambert Conformal Conic coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, selected buildings, fortification, and temples, shoreline features, and more. Relief shown pictorially, depths by soundings.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Pearl River Estuary Region : North, Guangdong Sheng, China, 1749 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte de l'entrée de la riviere de Canton : dressée sur les observations les plus récentes, par N.B., Ingr. ordre. de la Marine ; J.V. Schley direx. It was published by Pierre de Hondt in 1749. Scale [ca. 1:475,000]. Covers the Zhujiang Kou region, Guangdong Sheng, China. Map in French and Dutch.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Asia North Lambert Conformal Conic coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, selected buildings and fortification, shoreline features, and more. Relief shown pictorially.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Pearl River Estuary Region : South, Guangdong Sheng, China, 1749 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Carte des isles qui sont a l'embouchure de la riviere de Canton : dressée sur les observations des navigateurs, par N.B., Ingr. ordre. de la Marine ; J.V. Schley, direx. It was published by Pierre de Hondt in 1749. Scale [ca. 1:500,000]. Covers the Zhujiang Kou region, Guangdong Sheng, China. Map in French and Dutch. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Asia North Lambert Conformal Conic coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as drainage, cities and other human settlements, selected buildings and fortification, shoreline features, and more. Relief shown pictorially.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

Some effects of tropical storm Agnes on water quality in the Patuxent River estuary

A post Agnes study emphasizing environmental factors...weekly sampling at eight stations from 28 June to August 30, 1972. Spatial and temporal changes in the distribution of many factors, e.g., salinity, dissolved oxygen (DO), seston, particulate carbon and nitrogen, inorganic and organic fractions of dissolved nitrogen and phosphorus, and chlorophyll a were studied and compared to earlier extensive records. Patterns shown by the present data were compared especially with a local heavy storm that occurred in the Patuxent drainage basin during July 1963. Some interesting correlations were observed in the data. (PDF has 39 pages.)

Some effects of Hurricane Agnes on water quality in the Patuxent River Estuary

A post-Agnes study that emphasized environmental factors was carried out on the Patuxent River estuary with weekly sampling at eight stations from 28 June t o 30 August 1972. Spatial and temporal changes in the distribution of many factors , e.g., salinity , dissolved oxygen, seston, particulate carbon and nitrogen, inorganic and organic fractions of dissolved nitrogen and phosphorus, and chlorophyll a were studied and compared t o extensive earlier records. Patterns shown by the present data were compared especially with a local heavy storm that occurred in the Patuxent drainage basin during July 1969. Estimates were made of the amounts of material contributed via upland drainage. A first approximation indicated that 14.8 x l0 (3) metric tons of seston were contributed t o the head of the estuary between 21 and 24 June. (PDF contains 46 pages)

Egg production, spawning biomass and factors influencing recruitment of striped bass in the Potomac River and the upper Chesapeake Bay

Ichthyoplankton surveys in the Potomac River and Upper Chesapeake Bay were carried out in 1989 to estimate striped bass egg productions, age specific spawning biomasses of adult females, cohort-specific larval growth and mortality rates, and hatch dates of 8.0 mm larvae survivors. Possible consequences to recruitment of environmental factors were examined in 1989 and for data collected in 1987-1988. The temporal and spatial occurrences and distributions of eggs and larvae In both spawning areas are described and discussed in relation to environmental factors (temperature, rainfall, river discharge, pH, conductivity, zooplankton abundances) (PDF contains 319 pages)

Noise levels and sources in the Stellwagen Bank National Marine Sanctuary and the St. Lawrence River Estuary

Although ambient (background) noise in the ocean is a topic that has been widely studied since pre-World War II, the effects of noise on marine organisms has only been a focus of concern for the last 25 years. The main point of concern has been the potential of noise to affect the health and behavior of marine mammals. The Stellwagen Bank National Marine Sanctuary (SBNMS) is a site where the degradation of habitat due to increasing noise levels is a concern because it is a feeding ground and summer haven for numerous species of marine mammals. Ambient noise in the ocean is defined as “the part of the total noise background observed with an omnidirectional hydrophone.” It is an inherent characteristic of the medium having no specific point source. Ambient noise is comprised of a number of components that contribute to the “noise level” in varying degrees depending on where the noise is being measured. This report describes the current understanding of ambient noise and existing levels in the Stellwagen Bank National Marine Sanctuary. (PDF contains 32 pages.)