Six [6] Parking Links:

[1] 2019-10-19-New Blue Parking Stickers 
[2]  Parking Sticker Application  
[3]  2002/10/25 Parking Rules  
[4]  2017 "Parking Rules"  
[5]  Marylandfarms.org Parking Rules
[6] Hang-Tag Misuse
[7] 2003-Tow-Card

Same Six [6] Parking Links with comments:

[1]  2019-10-19-New Blue Parking Stickers Should use sticker instead of permit.
[2]  Parking Sticker Application  Each unit is entitled to one (1) parking sticker with a copy of vehicle registration.. Should be two (2) parking stickers with a copy of vehicle registrations.
[3]  2002/10/25 Parking Rules  Doesn't mention # of stickers.
[4]  2017 "Parking Rules"  (Written by one person with no proof reader perhaps) Has: 
        1. [sticker] must be placed in the front driver's side, lower corner of the window.
        2. Maryland Farms will issue up to two (2) stickers with valid registration and 
             one (1) visitor hang tag per unit.
         3. All vehicles must display current Maryland license plate tags. 
         7. If you purchase, lease or obtain a new car, you must come to the office 
              immediately to obtain a new Parking Sticker.  
              Add: Or use the Hang Tag until you get a new sticker.  
[5]  Marylandfarms.org Parking Rules Doesn't mention # of stickers.
[6] Hang-Tag Misuse
[7] 2003-Tow-Card