REMOVE

1. Mexico--Index maps
2. North and Central America

WHAT

1. Aeronautical charts--Mexi … (1)
2. GSGS (Series) ; 3507 (1)
3. Index map of Mexico 1:250 … (1)
4. Index map of Mexico 1:500 … (1)

WHERE

1. Mexico (2)
2. W 100º--W 90º/N 26º--N 20 … (1)
3. W 120º--W 72º/N 32º--N 0º (1)

WHO

1. United States. Army Map S … (2)

WHEN

1. 1933- (1)
2. 1947- (1)