Anette Sarnäs has written a book (in Swedish) about Oakley Ragland, Colin Campbell and the eight other American airmen that are buried in Malmö.
The airplane was a C-87, which is a rebuilt B-24.
C-87 is available at Wikipedia.
Tomas Lindblom has made a YouTube-documentary (in Swedish) based on a radio recording from 1986.
A list of foreign forced landings in Sweden 1939-1945 is available at The association Swedish Forced Landing Collection.
Close to the monument there is a cache for you who like geocaching. Coordinates to the cache can be found at www.geocaching.com.
Långareds Hembygdsförening have a list of other places near the monument that can be worth a visit.