Aerial survey methods for detecting forest insect outbreaks
Subtitle: 1951 season
By: By Robert C. Heller.
Contributors: Heller, Robert Chester, 1918-
Publisher: U.S. Dept. of Agriculture, Bureau of Entomology and Plant Quarantine, Division of Forest Insect Investigations
Published: 1952
Place of publication: Beltsville, Md
Language: eng
Number of pages: 27
Subjects: Aerial photogrammetry.; Forest insects.
Notes: Photocopy (positive)

"This report summarizes the work which has been done during the past three years on aerial surveying methods for the detection of forest insect damage." (Intro.)