Tests made to ascertain where conditions were most suitable for the 72-inch reflector microform - Harper, W. E. (William Edmund), 1878-1940,Dominion Observatory (Canada)

Tests made to ascertain where conditions were most suitable for the 72-inch reflector microform

Воспроизведено в оригинальной авторской орфографии издания 1915 года (издательство "Ottawa : Govt. Print. Bureau").

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