The Mad Scientists' Club Complete Collection (Paperback)
Even better, you can carry this around wherever you go and have every story right at your fingertips. And, like all paperbacks, after a while it will become dog-eared from constant use as you read and re-read the exploits of the seven junior geniuses of Mammoth Falls.
Written between 1961 and 1986, here is the Complete Collection of Bertrand R. Brinley's Mad Scientists' Club stories from The Mad Scientists' Club, The New Adventures of the Mad Scientists' Club, The Big Kerplop and The Big Chunk of Ice. All complete with illustrations by Charles Geer.