90 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Harder, Edmund Cecil. 
1073. The joint system in the rocks of southwestern Wisconsin and its 
relation to the drainage network. — Wisconsin Univ,, Bull., Sci. Ser., vol. 3, no. 
5, pp. 207-246, 10 pis., 1906. 
Describes investigations upon the directions of joints at localities in southwestern 
Wisconsin, and the drainage system, and discusses their relations. 
Hardinge, H. W. 
1074. The Cobalt district, Ontario.— Min. World, vol. 26, p. 215, February 
9, 1907. 
Hardman, John E. 
1075. Quebec's new mineral region. — Canadian Min. Rev., vol. 25, pp. 9-12, 
43-47, 1905. 
Includes notes on the geology of northern Quebec and the occurrence and character 
of ore deposits. 
1076. Cobalt, Canada, the new silver-mining district. — Eng. Mag., vol. 33, 
no. 1, pp. 21-34, 14 figs.. April, 1007. 
Includes an account of the geology and the occurrence and character of the ores. 
Harper, Roland M. 
1077. A phy topographical sketch of the Altamaha grit region of the coastal 
plain of Georgia. — New York Acad. Sci.. Annals, vol. 17, pp. 1-414, 2S pis., 17 
figs., September, 1906. 
Includes a general account of the geology of Georgia, particularly of the Altamaha 
grit region. 
Harris, Gilbert D. 
1078. Notes on elementary geologic mensuration. Ithaca, 1904. 61 pp. and 
tables. 
1079. Notes on the geology of the Winnfield sheet. — Louisiana Geol. Survey, 
Bull. no. 5. 36 pp., !> pis. (inch geol. map), 5 figs,, 1907. 
Describes the topography, economic resources, and the occurrence, character, and rela- 
tions of Cretaceous, Tertiary, and Quaternary deposits. 
1080. Cartography of southwestern Louisiana with special reference to the 
Jennings sheet. — Louisiana Geol. Survey, Bull. no. 6, 24 pp., 1 map, 1907. 
Harrison, Richard C. 
1081. Pockets in gold veins. — Min. and Sci. Press, vol. 94, p. 564, May 4, 
1907. 
Hartnagel, C. A. 
1082. Notes on the Ontaric, or Siluric, section of eastern New York. — Ab- 
stract: Geol. Soc. America, Bull., vol. 1(5, p. 582, 1906. 
1083. Stratigraphic relations of the Oneida conglomerate. — N. Y. State 
Mus., Bull. 107, pp. 29-38, 2 pis., 1907. 
1084. Upper Siluric and lower Devonic formations of the Skunnemunk 
Mountain region. — N. Y. State Mus., Bull. 107, pp. 39-54, 3 pis., 1 geol. map, 
1907. 
1085. Geologic map of the Rochester and Ontario Beach quadrangles. — 
New York State Mus., Bull. 114, 35 pp., geol. map, August, 1907. 
The accompanying text describes the occurrence, character, relations, and faunal con- 
tent of Silurian strata. 
1086. Structural relations and origin of the limonite beds at Cornwall, 
N. Y— Abstract : New York Acad. Sci., Annals, vol. 17, pt. 3, pp. 597-598, 1907. 
