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We have 4-sheet map, Republica del Peru, 1973, Instituto Geografico
Militar del Peru.  It indicates the village of San Martin de Pangoa,
on the Rio Sonomoro, between 500 and 1000 meters altitude.
Hope this helps.
 
Jerry Hogan
Central Washington University Library
(509)963-1545
e-mail [log in to unmask]