RUANDA URUNDI-Entire (1928) Cement factory. Illustrated postal card (N) of Belgian Congo overprinted for use in Ruanda-Urundi. Sepia photo of cement plant in Lubudi. Card #42 in series of 50. (ImageA)

ETATS UNIS-Meter cancel (1949) Femme (Pèlerine)* versant du sel. Empreinte violette de machine à affranchir sur fragment Pitney Bowes No 59783: 'Le sel en grains 'Diamond', le sel américain de qualité pour la table.' (ImageA)

NEW CALEDONIA-Deluxe proof (1955) Nickel mine. Deluxe sheet. Scott No C26, Yvert No PA 66. (ImageA)

U.S.A.-Meter cancel (1957) Bucket of molten steel. Red meter cancellation on cover front Pitney Bowes No 328524: 'Steel Centennial, 1857 - 1957.' (ImageA)

FRANCE-Deluxe proof (1959) Miner's lantern. Tools. Deluxe sheet. 175th anniversary of National Mining School. Scott No 914, Yvert No 1197. (ImageA)

SOMALI COAST-Imperforate (1962) Camels. Salt. Imperforate pair. Scott No C24, Yvert PA29. (ImageA)

SENEGAL-Deluxe proof (1964) Phosphate quarry. Deluxe sheet. Scott No 233, Yvert No 238. Hard to find! (ImageA)

SENEGAL-Deluxe proof (1964a) Dredging titanium. Deluxe sheet. Scott No 230, Yvert No 235. Some very light toning spots. (ImageA)

SENEGAL-Deluxe proof (1964b) Titanium extraction. Deluxe sheet. Scott No 231, Yvert No 236. Some toning spots. (ImageA)

SENEGAL-Deluxe proof (1964c) Cement works. Deluxe sheet. Scott No 232, Yvert No 237. Hard to find! (ImageA)

SENEGAL-Deluxe proof (1964d) Phosphate ore extraction. Deluxe sheet. Scott No 234, Yvert No 239. (ImageA)

SENEGAL-Deluxe proof (1964e) Mineral dock. Deluxe sheet. Scott No 235, Yvert No 240. (ImageA)

FRANCE-Deluxe proof (1970) Miner's lantern. Lens coat of arms. Mine pit head. Deluxe sheet. Scott No 1277, Yvert No 1642. (ImageA)

FRANCE-Artist proof (1970) Miner's lantern. Lens coat of arms. Mine pit head. Die proof in violet-brown signed by the engraver COMBET. Scott No 1277, Yvert No 1642. (ImageA)

FRANCE-Artist proof (1972) Mineshaft. Polish immigrants. Die proof in brownish-violet signed by the engraver BEQUET. Scott No 1358. Yvert No 1740. (ImageA)

FRANCE-Deluxe proof (1986) Quartz. Deluxe sheet. Scott No 2018, Yvert No 2430. (ImageA)

FRANCE-Deluxe proof (1988) The Four Elements. Set of 4 deluxe sheets. Scott Nos 2101-4, Yvert Nos PRE198-201. (ImageA)

NEW CALEDONIA-Deluxe proof (1994) Tiebaghi mine. Deluxe sheet. Scott No C269, Yvert No PA326. (ImageA)

NEW CALEDONIA-Deluxe proof (1995) Sebertia acuminata. Bloc gommé. Scott No 717, Yvert No 692. Hyperaccumulator of nickel. (ImageA)

ETATS UNIS-Meter cancel (1937) Chercheurs d'or. Cinéma. Empreinte rouge de machine à affranchir sur devant de pli Pitney Bowes No 56822: 'Les chercheurs d'or en 1937, un film de Warner Brothers.' (ImageA)