Numbering continues from Harvey Comics Hits (Harvey, 1952 series) #61 ('Casper, The Friendly Ghost #6'; October 1952); which was a continuation of: Casper, The Friendly Ghost (St. John, 1949 series) #1 to #5
See also: The Friendly Ghost, Casper (Harvey, 1958 series) which started at #1.
For the first Harvey Comics appearances of Casper, see: Little Audrey (Harvey, 1952 series) #25 (August 1952; also the first Harvey appearance of Baby Huey) and: Harvey Comics Hits (Harvey, 1952 series) #60 ('Paramount Animated Comics'; September 1952)