Year : 1930

• Atlas Africanus / 6 Frobenius, Leo (Ed.) ; Ritter von Wilm, Ludwig (Ed.) Berlin [u.a.] : de Gruyter, 1930

• Atlas Africanus / 7 Frobenius, Leo (Ed.) ; Ritter von Wilm, Ludwig (Ed.) Berlin [u.a.] : de Gruyter, 1930

• Mafia : the provisional issues of the postage stamps / by Charles H. Greenwood Greenwood, Charles H. London : D. Field, 1930