I'm not sure what their value should be. New records (45 rpm) sell for about US $5 each; old records sell for about $1 to $2.50. Your records are out-of-print, and may be worth more.
You could try to work out a deal with me (since I'm interested), or you could try your luck on a service such as E-Bay.
In any case, the first step would be to make a list of the records. Be sure to include the 'title', 'label', 'label-number', and 'artist'.
Also, try to ascertain the quality of the records. Are they in good condition? Are they in their original jackets? Do they have visible scratches or dirt? Do they sound scratchy? Do they skip, hiss, or pop?