Good luck!
https://archive.org/search?query=assimil
https://archive.org/details/dutchwithouttoil00cher
For as long as the dogs will let it exist.
You can also find it online, but be sure to find the audio files also. They are essential. Each of the 100+ lessons are like this: After rereading the lesson text with the notes until you can read it without assistance - you then listen to the audio until you can understand the audio without reading the text, then you say it out loud until you can say it at the same speed as the audio without difficulty. So half of the course length involves the audio.