Halliday, W. R. (1963). Caves of Washington. State of Washington, Dept. of Conservation, Division of Mines and Geology.
Citace podle Chicago (17th ed.)Halliday, William R. Caves of Washington. Olympia, Wash.: State of Washington, Dept. of Conservation, Division of Mines and Geology, 1963.
Citace podle MLA (8th ed.)Halliday, William R. Caves of Washington. State of Washington, Dept. of Conservation, Division of Mines and Geology, 1963.
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