I could find no sites specifically dedicated to Massey tractors, but several general tractor sites with sections on Massey. Here's on such site with a writeup and pictures: http://www.tractorshed.com/mh.html
You can go to masseyferguson.com or various online websites the focus on massey tractors. Search engines are also a good place to find reviews on tractors.
Massey Harris Tractors have a collectors website. In addition to this there are other websites that provide the information sorted by model. There are a variety of websites giving lots of information whether you are a collector or just interested in learning more.
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A Massey tractor costs $18,332. One can purchase the item online at websites like Tractors Find the Best, Market Book, Tractor House, Farm Auto Trader, etc.
There is no company listed in Massey, Maryland that sells tractors. The closest towns to Massy that sell tractors are Warwick, Middleton and Clayton. Check your local craigslist to see if there is anyone in you area with one for sale.
1968 http://www.masseyfergusontractorparts.net/Massey-Ferguson-tractors/2008/06/massey-ferguson-135-serial-numbers/
1968 http://www.masseyfergusontractorparts.net/Massey-Ferguson-tractors/2008/06/massey-ferguson-135-serial-numbers/
One can purchase farm tractors new from a farm tractor dealer, such as John Deere, Massey Ferguson, etc. which could be found in a phone directory or online at yellowpages.com. One could also purchase a farm tractor from an individual by looking in the newspapers, online at website like www.craigslist.com. Also there are websites that sell new and used tractors such as tractorhouse.com. Tractorhouse.com has thousands of tractors.
There are no specific statistics for Iowa, but nationally John Deere and Massey Ferguson are among the best selling tractors.
Sir Jack Richards and Sir Kori O'sullivan - Glassey.
John Deere tractors are the best selling and most well known brand of tractors. Other popular brands are Massey Ferguson, New Holland and Ford.
1974 http://www.tractordata.com/farm-tractors/000/7/4/746-massey-ferguson-165.html