According to the Internet source given below, John Milton Delcamp was an American pianist born in Norristown, Pennsylvania. After studying at Coombes Conservatory in Philadelphia he made his career as a silent film accompanist as well as making piano rolls for Republic Roll Co. and the Ampico Roll Company. Of ragtime interest is his Rackety Rag (1920) which was neither published or copyrighted existing only as a piano roll.
This list is arranged in chronological order and contains 4 works by John Milton Delcamp (1892-1931). It does not claim to be complete and represents only the number of items located. Key: Electronic Resource Items