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Authors whose works are in public domain in at least one jurisdiction

List of works by Walden Penfield Pratt

Aeromagnetic and geologic map of part of the Silver City mining region, Grant County, New Mexico

article by William Rich Jones et al published 1964 in Geophysical Investigations Map

Aeromagnetic survey of part of Dickinson County, Michigan, with preliminary geologic interpretation

article published in 1952

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