topo map reference icon ??

Dimeman

New member
Here is a section from a 1957 topo map of a location I want to get permission to search. Does anyone know what these ovals and hashmarks represent on a topo map????? I tried looking up the symbols for topo maps and didn't see these on the icons. Any map specialsists on here????

1957 topo map section.jpg
 
I have never seen symbols like that on any maps I've looked at :dontknow: I hope some can shed some light Robbie .
 

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