These lapbooks are the first books I've made with two children at once. I worked through Usborne's First Encyclopedia of Space with my kindergartener and second grader. I went through the book ahead of time, decided which information should be included in the books, made two sets of mini-books to hold the information, and kept each set of books (along with an assortment of graphics from
Google Image Search) in a freezer-size Ziploc. This allowed me to work with each boy at his ability level without dealing with the physical aspect of lapbooking. Completion of this lapbook also fulfilled requirements for my 2nd grader to earn his Astronomy academic belt loop for Cub Scouts. Follow this link for a complete list mini-books in these lapbooks.
Kindergarten Cover on left, 2nd-grade cover on right. Large graphics from National Geographic. It is easy to find cheap or free back issues at library book stores.
Covers open: Kinder book on top; 2nd on bottom. You can see that the folds and images are all the same between the books. Both books have a right flap extension and a center extension that flips up.