Metadata for Older PDF Editions of

Welcome to Option
Page edition: 2024-08-10
original 3rd Edition source media art: floppy disk and USB sticks Site Home

 original 1st Edition source media art: floppy disk  original 2nd Edition source media art: floppy disk and USB stick

Version Logs

Use this metadata to validate that any copies obtained from uncertain sources are authentic. Only the latest Edition is available for download, via the site's parent⍐page.

2024-08-10 PDF: (current web edition)
See the parent⍐page for current edition metadata.
2023-11-27 PDF: (Second web edition)
Web release of Second Earth Edition.
∅ no longer available ∅
  Size: 3 487 972 bytes
  Modified:  2023-11-27T10:38:56 in PDF File Properties
  MD5: 3d997af152036f4ffb7e1357cb62d0e8
  SHA-1: 7a692b9ace942bd2631937821271ecd7fb6e17a6
2021-03-21 PDF: (post-print 1st Earth Edition)
Re-rendered only to add print publication date.
∅ no longer available ∅
  Size: 3 358 628 bytes
  Modified:  2021-03-21T13:07 in PDF File Properties
  MD5: e6c26b9de9f5baa551f74cb29670683f
  SHA-1: 989ee08066281fc6c93bf544b6061c1e22548183
2021-03-09 PDF: (initial web 1st Earth Edition)
∅ no longer available ∅
  Size: 3 358 595 bytes
  Modified:  2021-03-09T13:59 in PDF File Properties
  MD5: 5ea94c0e8161818fdf8d36f36ddfe87b
  SHA-1: c6a1a4cc7a691148428d22db7a6c95d207c0fcd8