Reddit reviews Gravity Falls Dipper's and Mabel's Guide to Mystery and Nonstop Fun! (Guide to Life)
We found 2 Reddit comments about Gravity Falls Dipper's and Mabel's Guide to Mystery and Nonstop Fun! (Guide to Life). Here are the top ones, ranked by their Reddit score.
Disney Press
There isn't an official Journal 1 or 2 yet, but there is a Journal 3! There's two editions: the normal journal, and the limited-edition blacklight collector's journal. If you're lucky you might be able to find another blacklight edition for sale somewhere, but they're usually very expensive. The normal Journal 3 is still for sale and more affordable though. Here's a link to it on Amazon. (Pricing may vary in other countries.)
There's also Dipper's and Mabel's Guide to Mystery and Non-Stop Fun and Gravity Falls: Lost Legends.
http://www.amazon.com/gp/product/1484710800/ref=pd_lpo_k2_dp_sr_2?pf_rd_p=1535523722&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00EAHX876&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=08H0HEPJ6SE4N97MSQJ0
That's the mystery book.