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1
by Seger, Hermann August, 1839-1893
Easton, Pa. : Chemical Publishing Company, 1902

Book
2
by Seger, Hermann August, 1839-1893
Berlin : Verlag der Thonindustrie-zeitung, 1896

Book
3
by Seger, Hermann August, 1839-1893
Easton, Pa., Chemical Pub. Co., 1902

Book