1. 1
   On a thermo-electric method of measuring photographic magnitudes

   由 Schilt, Jan
   出版 1924

   Groningen, Gebroeders Hoitsema, 1924.

   31, ii p. incl. diagrs., tables. fol.

   “...Gebroeders Hoitsema,...”
   

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2. 2
   The coefficient of differential galactic absorption .

   由 Raimond, Jean Jacques, 1903-1961
   出版 1934

   Groningen, Gebroeders Hoitsema, 1934.

   4 p.L., 45 p., 1 L. 1 illus., tables. 31 1/2 x 24 1/2cm.

   “...Gebroeders Hoitsema,...”
   

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