Bulletin

Part of the illustrative material is folded

Vol. 1-ser. 2, v. 5 were published in Paris

Ser. 2, v. 15, no. 3-4, ser. 3, v. 2, no. 2 and 4, v. 4, no. 2 and v. 7, no. 4 from Études sur le terrain houiller de Commentry