...The pens or enclosures used cannot be covered, as this would interfere with the workings of the triggers... 
A. R. (Arthur Robert) Harding 「Deadfalls and Snares」
...The traps mostly used were bear pens and deadfalls...
Eldred Nathaniel Woodcock 「Fifty Years a Hunter and Trapper」
...We also built two bear pens...
Eldred Nathaniel Woodcock 「Fifty Years a Hunter and Trapper」
...Cleaning and Bedding the Pens...
Harry M. Lamon 「Ducks and Geese」
...Thereforethe pens must be cleaned out as often as may benecessary to accomplish this purpose...
Harry M. Lamon 「Ducks and Geese」
...Bedding the pens must bedone more frequently, usually about every otherday...
Harry M. Lamon 「Ducks and Geese」
...Fresh bedding will help to absorb the droppingsand will keep the pens from becoming sloppyor sticky...
Harry M. Lamon 「Ducks and Geese」
...Yardsare used in connection with this house which are thesame width as the pens and 50 feet in length...
Harry M. Lamon 「Ducks and Geese」
...1 house the pens in this house should becleaned at least once a week and they should bebedded with straw or other bedding material everyother day...
Harry M. Lamon 「Ducks and Geese」
...To get the bestresults the geese should be kept as quiet as possibleand to accomplish this the pens are partly darkenedand the geese disturbed only at feeding time...
Harry M. Lamon 「Ducks and Geese」
..." There should be separate apartments for the males andfemales, and also some smaller breeding pens...
A. R. Harding 「Fur Farming」
...I say nothingabout the millinery with which people often hang their pens,the satin cushions, etc...
Mrs. Leslie Williams 「A Manual of Toy Dogs」
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