Combination sub-floor and top floor
作者： Clarence U Gramelspacher
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lens.org参考文章(3)
Stuart Daniels Ernest, Pitman Schuck Harold, Parquet flooring and wall paneling ,(1924)
Charles Ross Frederick, Henry Skinner John, Manufacture of parquetry and wood mosaic ,(1923)
Clarence C Fulbright, Ply wood floor block ,(1940)