REMOVE

1. Mexico 1:500,000
2. Mexico 1:500,000
3. Aeronautical charts--Mexico
4. GSGS (Series) ; 3507
5. North and Central America
6. United States. Army Map Serv …

WHAT

1. GSGS (Series) ; 3507 (1)
2. Index map of Mexico 1:500 … (1)
3. Mexico 1:500,000 (1)
4. Mexico--Index maps (1)

WHERE

1. Mexico (1)
2. W 120º--W 72º/N 32º--N 0º (1)

WHEN

1. 1933- (1)