French guides from late 80's

 Tableau
01 - 50 programs for zx81
02 - devices plugins for ZX 81 - October 83
03 - Passport for Applesoft - June 1983
04 - Passport for Basic
05 - Mathématics for ZX 81 - 80 programs
06 - Passport for ZX 81 - September 83
07 - 50 programs for Casio FX-702p and FX-801p - September 83

 Information about the author on french Wikipedia
08 - 60 programs for casio PB-100 - April 84
09 - utilities for zx81
10 - Passport for Commodore 64
11 - Assembler for TRS 80
12 - 30 Programs for Commodore 6413 - From ZX 81 to Spectrum, 25 programs
14 - initiation a la micro-informatique le micro processeur
15 - 40 utilities for casio PB-700 - September 84
16 - Passport for Basic TO7 and TO7-70
17 - 35 programs for Oric 1 + Atmos
18 - 40 programs for X-07.JPG - January 85

 Scan : Bernouilli
20 - Program with machine language and play on ZX 81
21 - 30 Programs for TO7 and TO7-70