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Charles Ezra Sprague, 1888. Hand-book of Volapük. Dabükot folid (4id). New York (Tats-Pebalöl Meropa), London (Linglän), Chicago (Tats-Pebalöl Meropa): The Office Company.
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Charles Ezra Sprague, 1888. Manual de Volapük.
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Charles Ezra Sprague, 1888. Potakad lü Zänabür Volapüka.
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