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Index of Plant Virus Diseases
Set includes revised editions of some issues.
Film Strips of the U.S. Department of Agriculture
This publication, the thirty-first annual Directory of Officials and Organizations Concerned with the Protection of Birds and Game, follows the same general form as previous editions.
The Influence of Weather on Crops, 1900-1930
This bibliography is mainly concerned with the influence of weather on crops in connection with the germination, growth, development, susceptibility to disease, and final yield. It contains references to laboratory studies, field studies, and statistical studies on the effect of different conditions of temperature, precipitation, humidity, light, and wind on vegetation in many parts of the world.
Horticultural Exhibitions
The object of horticultural shows is to arouse the interest of citizens and their families in plant growth. This publication revises and supersedes Department Circular 62 "Horticultural Exhibitions and Garden Competitions," and provides a framework for organizing competitions.
