Magnetic Core Memories
This page has a picture of the first commercially produced core memory. It was for the IBM 405 Alphabetical Accounting Machine.
This page has a pic of a 13-plane x 4096 bit core memory stack.
MAGNETIC CORES (Naval Education and Training Command 1978)
This page has two nice pictures.
This page features some pictures of a 10,000 Bit magnetic core memory.
The Wikipedia page.
This page has some pics of rare rod-shaped cores.
Magnetic Core Memory Principles.
From this page:
It is 2.75 by 5.00 inches. Four blocks of 4,096 cores, two on each side, for a total of 16,384 cores, or a whopping 2KB. That's almost enough to store just the text on this page.