Commodity loans and marketing quotas. Hearings, Seventy-seventh Congress, first session on S. 935.

Mode of access: Internet.

Report of the annual convention

Mode of access: Internet.

Proceedings of the National Symposium on Transportation for Agriculture and Rural America /

Mode of access: Internet.

A Review of U.S. competitiveness in agricultural trade.

Item 1070-M

Agricultural postharvest technology and marketing economics research : a technical memorandum.

Mode of access: Internet.

Farm relief; a brief on the McNary-Haugen plan,

Mode of access: Internet.

Taxation under the A. A. A. (Agricultural adjustment administration)

Mode of access: Internet.

A Map of the United States of N. America.

Photostat from: Bailey's pocket Almanac for 1785.

A map of the United States of North America /

Shows many roads, has "Tennassee" on sheet 3, as well as the 22 line boundaries note.

Military map of the United States of America : showing location of all forces in training /

Relief shown by hachures.

Civil War, 1861-1862 /

Shows movement of Union and Confederate forces, location of their respective victories, extent of their respective territories controlled in Dec. 1862, and the Union naval blockade.

Civil War, 1863-1865 /

Shows movement of Union and Confederate forces, location of their respective victories, extent of their respective territories controlled in March 1865, and the Union naval blockade.

Latitude variation in pancreatic cancer mortality in Australia

Objectives: Ecological studies support the hypothesis that there is an association between vitamin D and pancreatic cancer (PaCa) mortality, but observational studies are somewhat conflicting. We sought to contribute further data to this issue by analyzing the differences in PaCa mortality across the eastern states of Australia and investigating if there is a role of vitamin D-effective ultraviolet radiation (DUVR), which is related to latitude. ---------- Methods: Mortality data from 1968 to 2005 were sourced from the Australian General Record of Incidence and Mortality books. Negative binomial models were fitted to calculate the association between state and PaCa mortality. Clear sky monthly DUVR in each capital city was also modeled. ---------- Results: Mortality from PaCa was 10% higher in southern states than in Queensland, with those in Victoria recording the highest mortality risk (relative risk, 1.13; 95% confidence interval, 1.09-1.17). We found a highly significant association between DUVR and PaCa mortality, with an estimated 1.5% decrease in the risk per 10-kJ/m2 increase in yearly DUVR. ---------- Conclusions: These data show an association between latitude, DUVR, and PaCa mortality. Although this study cannot be used to infer causality, it supports the need for further investigations of a possible role of vitamin D in PaCa etiology.

Persistent navigation and mapping using a biologically inspired SLAM system

The challenge of persistent navigation and mapping is to develop an autonomous robot system that can simultaneously localize, map and navigate over the lifetime of the robot with little or no human intervention. Most solutions to the simultaneous localization and mapping (SLAM) problem aim to produce highly accurate maps of areas that are assumed to be static. In contrast, solutions for persistent navigation and mapping must produce reliable goal-directed navigation outcomes in an environment that is assumed to be in constant flux. We investigate the persistent navigation and mapping problem in the context of an autonomous robot that performs mock deliveries in a working office environment over a two-week period. The solution was based on the biologically inspired visual SLAM system, RatSLAM. RatSLAM performed SLAM continuously while interacting with global and local navigation systems, and a task selection module that selected between exploration, delivery, and recharging modes. The robot performed 1,143 delivery tasks to 11 different locations with only one delivery failure (from which it recovered), traveled a total distance of more than 40 km over 37 hours of active operation, and recharged autonomously a total of 23 times.