This is a fantastic French course by Librairie Hachette comprised of four text books:
Volume 1 (1953): 65 lessons accompanied with very high quality audio. (A0 to A1+)
Volume 2 (1955): 70 lessons accompanied with very high quality audio. (A1+ to B1-)
Volume 3 (1957): 110 lessons (I am not aware if audio files were ever made.) (B1- to B2+)
Volume 4 (1959): 200+ writings from venerated French authors spanning across centuries of France's history (I highly doubt that audio files were made to accompany the writings.) This volume does not have any exercises at all. Pure speculation: B2+ to C1.
I am extremely impressed by the courses (having completed the first three volumes) and would speculate that all four volumes would ultimately take a student from A0 to C1. Despite all instructions being in French from the 1st volume, a motivated student can work around the instructions-are-in-French quandary by inferring from the diagrams. For the best results, I would recommend that one go through an Assimil (or two) and/or Linguaphone (or two) in parallel
1. Outstanding grammar explanations (looking at you, Mr. Assimil).
2. Very high quality audio (Vol 1 & 2) which makes me really wonder what happened to FSI/DLI audio files over time? Voice actors speak naturally and with faster speech than most courses.
3. Lessons are of Goldilocks-length: not so short that they make one wonder if one learnt anything (a la TYS French) and not so long as to completely strain one's attention (Linguaphone French 1971).
4. An exceptionally detailed account of what concerns France and its citizens- geography, economics, politics, religion, history and culture - particularly in the first dozen years after WW2.
1. Those who are hell-bent on sounding as "hip" and "cool" as possible needn't apply here! These courses contain anachronistic speech.
2. Outstanding grammar explanations in French, which is a huge deterrent to anyone without any prior knowledge of the language.
3. A fairly steep learning curve that will put off all, but the most motivated of students. Vol 1 is not for your typical A0 student who is not using other courses in parallel.
I posted a snippet of the 3rd volume's preface below.