Intel 82579 datasheet in PDF form, apparently volume 2.1 judging by the name. The 82579 is an Intel Gigabit Ethernet PHY found on many desktop and laptop boards.

Intel datasheet, volume 1, covering the LGA 2011 processor socket platform, supplied as a 908 KB PDF.

Datasheet in PDF, around 2.6 MB, for socket 1150, the Intel LGA1150 platform used by Haswell and Broadwell desktop CPUs.