List of books I'd like to make book articles about:
Japanese in Thirty Hours (romaji only, but exceptionally useful little book to get a succinct and understandable basic grammar summary)
Le Francais Par Le Methode Nature (a Nature Method textbook, teaches 3000 common words entirely in the target language French using images and French explanations only. It is an interesting glance in how some language textbooks once taught. I wish nature method textbooks were still being made, this textbook helped my French significantly. I think Lingua Latina is one of the only nature method textbooks still used often nowadays)
All Spanish Method (a Direct Method textbook, note the similarities and differences compared to the Nature Methof textbook style. Particularly that Direct Method books contain some explanations in another language, and may require a teacher to understand some of the target language material. An interesting look into this older style of textbook)
Madrigal's Magical Guide to Spanish (wonderful summary of a lot of cognates and grammar patterns, I liked all the Madrigal books, I also used the French one)
German through Pictures (german taught through pictures as the only explanations, I wish more books like this existed)
Chinese Grammar Self-Taught by John Darroch (love the explanations in this, also the glance into how Chinese was taught in the 1920s)
Beginning Chinese Reader by DeFrancis (and Intermediate, and Advanced, all amazing Graded Readers. I havent read these in a while, but I renember they taught 1500 hanzi and 10,000 words from those hanzi, with built in natural review of words learned by using words from prior lessons in later lessons, and thousands of pages of reading practice)
Russian Language in 25 Lessons by Artemiy Belyaev (amazing short grammar guide)
Barrow Japanese at a Glance (all Barrow at a Glance books include short grammar summaries which I find particularly nice to include in phrase books)
Learn to Read in Japanese, A Japanese Reader Volume 1, by Roger Lake and Noriko Ura (they also made the free and incredibly useful japaneseaudiolessons.com, I love all the books they've made)
Spanish for Beginners by Charles Duff (I love all the textbooks Duff has written, they include learning by reading passages in the language)
Basic Patterns of Chinese Grammar by Qin Xue Herzberg and Larry Herzberg (great short grammar guide, helpful for identifying mistakes you may be making)
Tuttle, Learning Chinese Characters: A revolutionary new way to learn and remember the 800 most basic Chinese characters by Alison Matthews and Laurence Matthews (hands down my FAVORITE book to learn characters, helped me more than any other hanzi or kanji book or resource I've used, this is the book I constantly recommend to beginners)
Chinese Characters: Learn and Remember 2,178 Characters and their Meaning by Alan Hoenig (a good follow up book to learn more hanzi with mnemonic stories, but I'm forever disappointed this book doesn't incilude pronunciations. I prefer this book over Heisig's Remember the Hanzi, if you have to use one of them)
Reading Japanese by Eleanor Harz Jorden and Hamako Ito Chaplin (as I love by reading, I found this book, which provides a lot of reading practice and is a nice companion to another basic textbook like Genki)
A Japanese Reader: Graded Lessons for Mastering The Written Language by Roy Andrew Miller (this book has practice ranging from beginner to "learning to read newspapers and literary texts." I got it because a reviewer mentioned that after working through this book, they found they could easily read the newspapers and many fiction novels. The claim made me curious)
Rapid Literacy in Chinese, The Most Common Chinese Radicals, Intensive Spoken Chinese, all by Zhang Pengpeng (meant to be used together, teaches 40 conversational lessons and 1000 commonly used words and grammatical notes, 100 chinese radicals and basic structure of chinese characters, 750 commonly used words and 1300 words formed from them into 25 sentences and 25 conversational dialogues and 4 narrative prose pieces. It all combines to a quite solid foundation. This is an example of a decent beginner textbook option for Chinese, versus another textbook I found once which only taught 100 words - which was pathetically little)