Hi:

I have a researcher who's looking for some sheets in the Mexico 1:50,000
Geologic maps that we don't have.  Here are the sheets she's looking for:

H-13 A-21
H-13 A-22
H-13 A-31
H-13 A-32
H-13 A-41
H-13 A-42
H-13 A-51
H-13 A-52
H-13 A-61
H-13 A-62
H-13 A-71
H-13 A-72
H-13 A-81
H-13 A-82
H-13 C-11
H-13 C-12

I'm not sure if these have been published.  Thanks!

Chris Kollen

Chris Kollen
Social Sciences Team
University of Arizona Library
P.O. Box 210055
Tucson, AZ   85721-0055
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(520) 621-4869