TY - RPRT TI - Provisional flat plate solar collector testing procedures : first revision AU - Waksman, David AU - Streed, Elmer R AU - Reichard, Thomas W AU - Cattaneo, Louis E PY - 1978 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 78-1305a DO - 10.6028/NBS.IR.78-1305a ER -