ADAM HILGER, 1937

Hilger Catalogue E : Spectrographs : July 1937 / Adam Hilger Ltd. optical instrument makers, 98 Kings Road, Camden Road, London, N.W. 1, England. – [S.l : S.n.], 1937 (Great Britain). – 60 p. : ill. ; 25 cm. + 2 listini prezzi.

Testo in inglese.