25-175 usd
Have you tried a web search? Local Library? Do a web search on Harrington and Richardson Books and you will find some sources.
Depends on condition, caliber, etc.. Prices can range from 100-700 USD
Cornell Publications may have a book on H&R history
20-500 USD or so depending on specifics
100 or so
200 or so
$200
100-300 USD
Need more information. I Cannot find a reference to an H&R Model 25 bolt action rifle
Yes
50-100 or so
$100