Where Did I Find This Map?

I have worked on tracing my Ciske ancestors off and on for more than ten years. I would count at least eight of those years as a newbie, also called a "baby," genealogist. I happily spend hours online clicking, reading, downloading, and completely ignoring and not documenting where I found information.

In my files I have an image of a plat map showing portions of Mantiwoc and Calumet counties in Wisconsin. One of the plats is labeled "J. Cziske," so I am sure I saved it because it relates to my family. However, that is all I can recall. I know I saved in the morning on 10 November 2010, a Wednesday of all days, but where I found it, no clue.

Thankfully I found an alternative map for the same location and year which I can correctly document with a source citation.

My lesson learned is two-fold:

1. I will probably need to relocate the source for many of my early finds which I excitedly downloaded and neglected to document. 
2. Everything, regardless of how I obtained it, needs to be documented in some fashion so that I can properly source it later.