Verify your download
A SHA-256 checksum lets you confirm that a downloaded book is byte-for-byte identical to the file built by this project.
Current files
| Download | Size | SHA-256 |
|---|---|---|
| Illustrated PDF When_the_Machines_Were_Young_digital.pdf | 47.4 MiB 49,715,669 bytes | 33ca3d18 |
| A4 home printing PDF When_the_Machines_Were_Young_home_A4.pdf | 9.9 MiB 10,413,891 bytes | 4ae79b69 |
| US Letter home printing PDF When_the_Machines_Were_Young_home_Letter.pdf | 9.9 MiB 10,415,265 bytes | ec69553e |
| Large-text PDF When_the_Machines_Were_Young_large_text.pdf | 14.7 MiB 15,449,379 bytes | b6e124a1 |
| Low-ink illustrated PDF When_the_Machines_Were_Young_low_ink.pdf | 12.3 MiB 12,939,649 bytes | 6db3432e |
| Full illustrated EPUB When_the_Machines_Were_Young.epub | 26.8 MiB 28,128,279 bytes | f265a516 |
| Lite illustrated EPUB When_the_Machines_Were_Young_lite.epub | 11.1 MiB 11,631,165 bytes | 58af9480 |
The home editions use ordinary A4 or US Letter paper. The large-text edition reflows at 18 point. The low-ink edition retains outlined illustrations with a measured toner budget. The full EPUB keeps the largest reader images. The lite EPUB contains the same text, alternative text, navigation, and illustrations at smaller dimensions and a lower download size.
How to check
Download the plain checksum file, place it beside the book files, then use a SHA-256 utility on your device. Compare all 64 hexadecimal characters.
A matching value proves file integrity. It does not replace the accessibility, provenance, or publication information supplied with the book.