5 books
Travels of Doctor and Madame Helfer in Syria, Mesopotamia, Burmah and Other Lands, Vol. 2 of 2 (Classic Reprint)
Johann Wilhelm Helfer's Reisen in Vorderasien Und Indien, Vol. 2 of 2 (Classic Reprint)
Travels of Doctor and Madame Helfer
Travels of Doctor and Madame Helfer in Syria, Mesopotamia, Burmah and Other Lands (Volume 2)
Travels of Doctor and Madame Helfer in Syria, Mesopotamia, Burmah and Other Lands Volume 1