This Indian Head Test Pattern is a copy made from a television camera alignment slide. An 18"X24" image.
I tried to find a good test pattern on the Internet and was unable to. The ones that I found on the Internet were poor jpg images. They had lots of artifacts, which wouldn't allow the resolution bars or contrast gradations to be well defined.
The copy presented here is a good photo that allows full resolution.
I have a smaller image below and the full image at the bottom. If you wish to copy either of the images, place your cursor on the photo and right click your mouse. Click "save as" and choose the location on your directory