diff --git a/pdf/56. Information Resource Guide - Computer, Internet and Network Systems Security.pdf b/pdf/56. Information Resource Guide - Computer, Internet and Network Systems Security.pdf new file mode 100644 index 0000000..685f976 Binary files /dev/null and b/pdf/56. Information Resource Guide - Computer, Internet and Network Systems Security.pdf differ diff --git a/pdf/57. The Hacker's Underground Handbook.pdf b/pdf/57. The Hacker's Underground Handbook.pdf new file mode 100644 index 0000000..fe489df Binary files /dev/null and b/pdf/57. The Hacker's Underground Handbook.pdf differ diff --git a/pdf/58. Guide to SCADA and Industrial Control Systems Security.pdf b/pdf/58. Guide to SCADA and Industrial Control Systems Security.pdf new file mode 100644 index 0000000..ec1aba2 Binary files /dev/null and b/pdf/58. Guide to SCADA and Industrial Control Systems Security.pdf differ diff --git a/pdf/59. The International Handbook of Computer Security.pdf b/pdf/59. The International Handbook of Computer Security.pdf new file mode 100644 index 0000000..86cbe6f Binary files /dev/null and b/pdf/59. The International Handbook of Computer Security.pdf differ diff --git a/pdf/60. The Code Book - How to Make It, Break It, Hack It, Crack It.pdf b/pdf/60. The Code Book - How to Make It, Break It, Hack It, Crack It.pdf new file mode 100644 index 0000000..d99533a Binary files /dev/null and b/pdf/60. The Code Book - How to Make It, Break It, Hack It, Crack It.pdf differ