Hopkins , W. C., & Williams, D. L. (1968). Converting factors for Southern pine products. State University.
Lua i Stíl Chicago (17ú heag.)Hopkins , William C., agus David L. Williams. Converting Factors for Southern Pine Products. Louisiana: State University, 1968.
Lua MLA (9ú heag.)Hopkins , William C., agus David L. Williams. Converting Factors for Southern Pine Products. State University, 1968.
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