ZX81 Books Starting with 0

20 Programs for the ZX Spectrum & 16K ZX81 20 Programs for the ZX Spectrum & 16K ZX81
30 Hour Basic ZX81 Edition 30 Hour Basic ZX81 Edition
49 Explosive Games for the ZX81 49 Explosive Games for the ZX81
49 Explosive Games for the ZX81 49 Explosive Games for the ZX81