Here’s a formula you can chuck away in your wallet, day timer or notebook that will help you determine what the lineal feet for
1/1000th of an care is for whatever row width you may encounter.
( 30 / Row width you are assessing ) X 17,423 = Lineal feet in 1/1000 of row
For that row width.
EXAMPLE : You are at a growers farm and he indicates that his corn is in 28 inch
Rows.
Here’s what you do :

( 30 / 28 ) X 17, 423 = 18,667 lineal feet for 1/ 1000th of an acre

You would measure off 18 ft 8 inches and do your stand counts.

Lets say you go to a grower and he’s planting in 22 inch rows.

( 30 / 22 ) X 17,423 = 23, 758 lineal feet for 1 / 1000th of an acre

In this case you would measure off 23 ft 9 inches and count plants.

As always the more counts you do the better overall assessment of
Stand count you’ll come up with.