diff --git a/Unix-DocumentationPreperation-bstj57-6-2115.pdf b/Unix-DocumentationPreperation-bstj57-6-2115.pdf new file mode 100644 index 0000000..de20a21 Binary files /dev/null and b/Unix-DocumentationPreperation-bstj57-6-2115.pdf differ diff --git a/Unix-LanguageDevelopement-bstj57-6-2155.pdf b/Unix-LanguageDevelopement-bstj57-6-2155.pdf new file mode 100644 index 0000000..7c79a31 Binary files /dev/null and b/Unix-LanguageDevelopement-bstj57-6-2155.pdf differ diff --git a/Unix-ProgrammersWorkbenh-bstj57-6-2177.pdf b/Unix-ProgrammersWorkbenh-bstj57-6-2177.pdf new file mode 100644 index 0000000..7a60c70 Binary files /dev/null and b/Unix-ProgrammersWorkbenh-bstj57-6-2177.pdf differ