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 | 45.1 MiB 47,331,528 bytes | f071f164 |
| A4 home printing PDF When_the_Machines_Were_Young_home_A4.pdf | 5.6 MiB 5,877,853 bytes | fb16539c |
| US Letter home printing PDF When_the_Machines_Were_Young_home_Letter.pdf | 5.6 MiB 5,877,757 bytes | 0ed69623 |
| Large-text PDF When_the_Machines_Were_Young_large_text.pdf | 7.6 MiB 7,998,225 bytes | 797858a3 |
| Low-ink illustrated PDF When_the_Machines_Were_Young_low_ink.pdf | 5.7 MiB 5,944,993 bytes | 8f6d78f2 |
| Full illustrated EPUB When_the_Machines_Were_Young.epub | 20.2 MiB 21,180,838 bytes | e1da3486 |
| Lite illustrated EPUB When_the_Machines_Were_Young_lite.epub | 5.9 MiB 6,185,171 bytes | 5f7e611e |
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.