Dutch Elm disease...man, I haven't heard anybody talk about that in 30 years. I remember it sweeping through Minnesota nad Wisconsin when I was a kid.
Slide film in 4x5: I came to 4x5 almnost directly from 35mm so, the big color slides just blew me away even without a projector. I hear that one can still get a "real" print from a slide using the Ilfochrome process and materials but, I haven't yet found any labs that will actually do it anymore.
Bob Carnie's lab in toronto Canada does Ilfo/Ciba-Chromes. I have seen the work and it is outstanding.