The following digitized map was found on searchiqs.com. Info Quick Solutions, Inc. (IQS) is a site that the Niagara County Clerk has partnered with to digitize many of their books and maps.
This LeValley Cemetery map was originally found in Book 12 on Page 1146.
What is especially interesting is that the map says “The tiers of lots numbered from 1 to 10 represent the original ground known as the Harrington Cemetery.” That is the first mention I have seen of a cemetery of that name in Niagara County. Will need to conduct some newspaper and map research to look for other mentions of Harrington Cemetery.