Champlin logo as used between the mid 70s to mid 80s.
From Bryan Sherrieb.

1959 map cover, donated by Chuck Knapp

Old Champlin sign still standing on MO 86
about 6 miles east of Neosho, MO.
2001 photo by David Backlin.

Champlin 1954 map scan from Robert Droz.

This is the logo for a short-lived Champlin off brand
used in the midwest for a few years during the mid-sixties.
The Champlin Harbor brand issued maps for at least one year
with a photo of one of these Harbor stations, using this logo.
Not related to the other Harbor brand on this website.
Information from David Aldred.