Books that give valuations include:
"Official Price Guide To the Beatles" by Perry Cox.
P.O. BOX 14945
Scottsdale, AZ 85267
http://members.aol.com/perrydcox/index.html
PerryDCox@aol.com
And you could try contacting some dealers and appraisers, e.g.
Rockaway Records
2506 N Glendale Blve
Los Angeles, CA 90039
(323) 664-3232
or
James N Mc Nally
PO Box 13
St. Clair Shores, MI 48080
(313) 881-5250
Or, you can try looking at http://www.gemm.com, to see if other similar records
are for sale and at what price.
Good luck,
Mario