Vashon Island Cooks compiled by Vashon Island’s Windrift Unit, Ryther Four and Twenty, Friends of Ryther Child Center-Seattle, Washington 1978
Ryther seems to have been a behavioral health treatment center for children. The book did not provide a lot of clues (or the Vashon connection beyond it being a ferry ride away from Seattle) but I can only assume sales benefited the treatment center.
The recipes range from many soups to main dishes broken down by main ingredient. A fair amount of vegetarian and tofu recipes for the era and breads.
Good amount of fresh fruit recipes especially in the dessert section.