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On photomosaic index: USDA 8171. Ais-21427. Item 4.
Title on index: Enlargement index map of Piatt County.
Flight dates: 6-19-40; 7-1-40; 7-29-40. Photos numbered AM-1A-3 through AM-5A-56.
Flying completed 7-29-40--Photomosaic index.
Complete in ca. 257 images. Title from photomosaic index.
Contact prints with stereoscopic coverage (60% overlap).
Extent
Remote-sensing images ; 24 x 24 cm + photomosaic index (1 remote-sensing image on 2 sheets ; 105 x 44 cm, sheets 61 x 51 cm) and index (1 manuscript map on 2 sheets ; 84 x 40 cm, sheets 51 x 48
On photomosaic index: USDA 8171. Ais-21427. Item 4.
Title on index: Enlargement index map of Piatt County.
Flight dates: 6-19-40; 7-1-40; 7-29-40. Photos numbered AM-1A-3 through AM-5A-56.
Flying completed 7-29-40--Photomosaic index.
Complete in ca. 257 images. Title from photomosaic index.
Contact prints with stereoscopic coverage (60% overlap).
Extent
Remote-sensing images ; 24 x 24 cm + photomosaic index (1 remote-sensing image on 2 sheets ; 105 x 44 cm, sheets 61 x 51 cm) and index (1 manuscript map on 2 sheets ; 84 x 40 cm, sheets 51 x 48