[Brief], 1882 Apr. 21, Aistersheim, [an] Herr[n Adolfo F. Möller, Coimbra] [manuscrito] / K. Keck.
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Correspondenz-Karte, 1888 März 9, Aistersheim, an Exmo Senhor Adolpho Moller, Coimbra [manuscrito] / K. Keck.
Correspondenz-Karte, 1888 Mai 23, Aistersheim, an Senhor Adolpho Moller, Coimbra [manuscrito] / Dr. K. Keck.
[Carta], 1909 Nov. 24, [Lisboa, a Júlio Henriques, Coimbra] [manuscrito] / Antonio X. Pereira Coutinho.
