1 "Ficheiro:The_transition-curve_field-book_.._(IA_transitioncurvef00howarich).pdf".

Ficheiro:The transition-curve field-book .. (IA transitioncurvef00howarich).pdf

recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_transition-curve_field-book_.._(IA_transitioncurvef00howarich).pdf...

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