No publication date in comic, date used is on-sale date.
from Richie Rich Vaults of Mystery (Harvey, 1975 series) #26 [with new coloring and some new lettering]logo from cover; background illustrations from various covers and stories
from Richie Rich Success Stories (Harvey, 1964 series) #30 [with new coloring]1st Chapter actually numbered pages 1-5. 2nd chapter entitled "Who Is the Friendly Phantom?" and numbered pages 1-5,
Warren Kremer is listed as artist in this issue, but Chris Barat of the webblog newsandviewsbychrisbarat.blogspot identifies the actual artist.
from Richie Rich Success Stories (Harvey, 1964 series) #27 [with new coloring]Obstetrician is Dr. Kremer
from Richie Rich: Rich Rescue (Ape Entertainment, 2011 series) #3 ([July 2011])
from Richie Rich Success Stories (Harvey, 1964 series) #6 [right side of illustration cropped]
in Richie Rich Gems (Ape Entertainment, 2011 series) #47 (2012)reprinted drawing with new text about this comics interior.