V. S. Government

Year Published: 1950

Creator: UNLESS otherwise indicated the sets of slides listed a catalog are black-and-white slides. Color slides are s Each set of slides is described as follows: (a) the ti name of the producing agency and the date of productio title if the slides are part of a series; content of the slides; (e) references number of the set of slides if it has such a number, t in the set, the size of the slides, and special notati Following these descriptive data are several numbers i These code numbers refer to specific instructions for slides which are explained on pages 306-329 of this ca to obtain the first set of slides listed below, for ex where under code number 27, directions are given for b slides from the U. S. Public Health Service. Activated Sludge Process U.S. Public Health Service

Format: Filmstrip

Description: Operation of screen chamber, grit chamber, primary clarifier, aeration tanks, secondary clarifiers, and other procedures in activated sludge process. Aerial and over-all ground views and graphic flow diagrams. (CDC-9-033.5; 41 slides, 2x2 in.) Aquatic Plants Associated With Anopheles Breeding Areas U.S. Public Health Service, 1949. Aquatic plants found in environs of representative breeding places of Anopheles quadriculatus, crucians and punctipennis in Southeastern states. Arranged according to system of Engler and Prantl. (CDC-5-092; 169 slides, color, 2x2 in.)

Complete Record: Series: Municipal Sewage Treatment Equipment and Structures Series No. 5 Type: Filmstrip Distribution codes: 27

Metadata Source:3434 U.S. Government Films