A link ;
http://www.smecc.org/call_sign_letter__meaning.htm
KIXI = IXI + roman numeral for 9-10
KMPC LA = Mcmillin Petroleum Company
KOA Denver = K(lear ) O(ver) A(merica)
KZEL Eugene = George Zeller ( orignal owner )
This data base has a whole lot of callsigns and their original meanings from all over the country.