- Four Brothers Sworn to a Mighty Oath Death..Romance..Mystery..Intrigue (Print Ad-New Oxford Item, ((New Oxford, Penna.)) 12 May 1938)
- Four valiant brothers...and a girl...fighting today's brooding menace as it stirs revolt, strikes sudden death, massacres innocents throughout the world! (Print Ad- Pittsburgh Press, ((Pittsburgh, Penna.)) 3 May 1938)
- Fighting today's brooding, unseen world-menace! Adventure as amazing as the pledge that unites them! (Print Ad-Daily Capital News, ((Jefferson City, Mo.)) 29 April 1938)
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