Hemlock stump. Birch log. September 25th." With notes

[From Jasper Cropsey Sketch book, 1855-1856]

The coupled trickling filter-activated sludge process : design and performance /

Mode of access: Internet.

Report on tests of welding filter plates /

Mode of access: Internet.

Fine solids removal following combined chemical-trickling filter treatment /

Mode of access: Internet.

Wastewater stabilization lagoon : intermittent sand filter systems /

Mode of access: Internet.

High daily rate trickling filter performance : under the direction of the Board of State Health Commissioners, Upper Mississippi River Basin Sanitaton Agreement /

Includes bibliographical references.

Gabor Peterdi, twenty-five years of his prints, 1934-1959.

Mode of access: Internet.

Long term recharge of trickling filter effluent into sand /

Mode of access: Internet.

Media log : a guide to film, television, and radio programs supported by the National Endowment for the Humanities, Division of Public Programs, Humanities Projects in Media.

Shipping list no.: 93-0162-P.

A preliminary investigation of the effectiveness of a diatomite filter in the removal of radioactive phosphorus from water /

"November 1, 1951."

The coupling and mutual impedance between balanced wire-arm conical log-spiral antennas /

Includes bibliographical references (76-77)

Analysis and design of the log-periodic dipole antenna.

At head of title: Antenna Laboratory.

Log periodic dipole arrays /

"Contract No. AF33(616)-6079 Project No. 9-(13-6278) Task 40572. Sponsored by: Wright Air Development Center"

Evaluation of filter flammability and filter bank fire detection systems /

"U.S. Atomic Energy Commission Contract AT(29-1)-1106."

Designs of filter plants, January 1900.

Mode of access: Internet.