TY - BOOK TI - Bulletin of the United States National Museum VL - no.21 (1881) UR - https://www.biodiversitylibrary.org/item/32345 PB - G.P.O CY - Washington PY - 1881 SN - 0096-2961 N1 - Many numbers issued in parts. --- No. 1-16 issued also in: Smithsonian miscellaneous collections, v. 13, 23-24. AU - United States National Museum KW - Natuurlijke historie KW - Natuurwetenschappen KW - Science ER -