1. 1
   Examination of water for sanitary and technical purposes

   由 Leffmann, Henry, 1847-1930
   出版 1889

   Philadelphia, Blakiston, 1889.

   1 p. ̋., V-VIII, 9-106 p. illus.

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2. 2
   Analysis of milk and milk products

   由 Leffmann, Henry, 1847-1930
   出版 1896

   Philadelphia, P. Blakiston, son & co., 1896.

   vii, 9-120 p. incl. illus., tables. 20 cm.

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