1897 51 p., 4 folded lithographed pls, paperbound (plain covers).
1900 iv, 35 (= pp. 49-83), folio, original printed covers. Annales du Musée du Congo Belge. Library stamps (Rijksherbarium Leiden + discard stamp). Covers loose.
1899-1900 iv, 72, iv, 83 p., folio, loose in boards (original printed covers, that of fasc. 1 laid on front board). Annales du Musée du Congo Belge. Library stamps (Rijksherbarium Leiden + discard stamp).