Very Large Record Collection of 78's

Have inherited around 240-300 of these old 78 record albums with 4-6 records in each leather-bound set. Collected in 30' and 40's by grandparents - mostly classical and a pile of about 60-80 33 1/3's marked Property of Standard Radio, Hollywood (play from inside out!). Look like some kind of master records for duplicating ??? Anyway, this is such a large amount of stuff I don't know where to begin. Anyone know of appraisers in Seattle area to look this over for me? I am knew to this so I hope these are appropriate questions.
Thanks