73. Þingvellir, Nikulásargjá. Collection: Icelandic and Faroese Photographs of Frederick W.W. Howell Location: Þingvellir þjóðgarður, Iceland Date: ca. 1900 Format: Image Creator: Howell, Frederick W. W.
74. Þingvellir, rift Collection: Icelandic and Faroese Photographs of Frederick W.W. Howell Location: Þingvellir, Iceland Þingvellir þjóðgarður, Iceland Date: ca. 1900 Format: Image Creator: Howell, Frederick W. W.
75. Elimination of taste and odor in water Creator: Baylis, John Robert, 1885- Collection: Core Historical Literature of Agriculture Publisher: McGraw-Hill Book Company, Inc., Publication Place: London : Date: 1935 Format: Book
76. Physiology of man in the desert Creator: Adolph, Edward F. 1895-1986. Collection: Core Historical Literature of Agriculture Publisher: Interscience Pub. Co., Publication Place: New York : Date: 1947 Format: Book
77. Applied hydrology Creator: Linsley, Ray K. Collection: Core Historical Literature of Agriculture Publisher: McGraw-Hill, Publication Place: New York : Date: 1949 Format: Book