The Iowa Association of Naturalists has a series of booklets available for download. Iowa's Shrubs and Vines, publication IAN0307 discusses "brambles" seen in Iowa's natural areas. Blackberry leaflets are wooly underneath. See page 6.
Reiman Gardens Publication RG501 discusses "Pruning Raspberries"
Fruit Cultivars for Iowa, PM 453 discusses cultivars of both Blackberries and Raspberries for Iowa gardens
Oyster Mushrooms from Heritage Hill Farm
Leave Some Stubble for the Bees, from the native Plants and Wildlife gardens website. another good reason to do less work in your garden and leave your garden less tidy!