You asked about the book about Elkton:
They might still have a book available for purchase
Elkton Community History 1879 - 1999
Elkton Museum and Historical Society
105 Elk Street
Elkton, South Dakota 57026
Monday - Friday...9 AM - 3 PM
I did find mention on page 379:
Of the three grocery stores in operation in 1954, Lovley's Grocery was founded in 1885 by Theodore Meyer. There is a picture of it on page 378.
Hope this helps. There isn't an index to this book.
To find information you basically have to read through 496 pages.
The only Myers buried in the St. Mary's Catholic cemetery - note the spelling difference - was a Helen Myers . She was born in 1927 and died Sep 25, 1987.