douglas fairbanks jr., Winthrop Rockefeller,

by Susan and Mark
(Middletown, CT)

My husband and I have been sorting through his father's military letters and cards. We have a number of personal letters, as well as signed cards of family photos, from Douglas Fairbanks, Jr. They knew each other in WWII when my father-in-law was a Major. We also have a number of Christmas cards sent to the family from Winthrop Rockefeller. Another one is a letter from Henry Ringling North on "Barnum and Baily" letterhead.

We would like to sell these items, but do not know how to go about finding out their value.

Can you help us?