Elementary Volume 6, contains the first-ever version of Oregon Trail.
http://www.gamefaqs.com/computer/apple2/review/R28704.html
http://www.the-underdogs.info/forum/viewtopic.php?p=715311#715311
http://www.gamefaqs.com/computer/apple2/review/R28704.html
http://www.the-underdogs.info/forum/viewtopic.php?p=715311#715311