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Berichtigter und ergänzter Sonderabdruck aus der Deutschen Briefmarken-Zeitung.
Kenyon, Brewster C.2385.15
History of the postal issues of Hawaii. A list of the adhesive postage stamps, stamped envelopes and postal cards of the Hawaiian government.
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Koefoed, O.*2237.75
Danske Postfrimærker, 1851-1901. En historisk Afhandling udarbejdet paa Grundlag af originale Aktstykker.
Kobenhavn, Jacobsen: 1901, 152, (4) pp., illus., portrs, pls. 8o. [Some of the plates are colored.]
Kohl, Paul. *2239a.123
Freimarken-Katalog, 1902.