tag:blogger.com,1999:blog-21077063.post4694903624427375468..comments2024-02-16T08:32:46.618+00:00Comments on Donald Clark Plan B: Overhead projectors: the trapezoid projection of boredomDonald Clarkhttp://www.blogger.com/profile/00796341486328270474noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-21077063.post-52662237454373773012012-09-30T13:10:55.682+00:002012-09-30T13:10:55.682+00:00This comment has been hidden from the blog.jayhttps://www.blogger.com/profile/16271633210993298646noreply@blogger.com