Cecidomyiidae
Information from Wikipedia on this family of flies, commonly known as gall midges or gall gnats. Although tiny, many are economically significant pests of crops.
http://en.wikipedia.org/wiki/Cecidomyiidae

Macrodiplosis quercusoruca: Vein Pocket Gall
Photographs of the gall caused by this midge, with information on its hosts, symptoms, life cycle and description.
http://www.ento.okstate.edu/ddd/insects/veinpocketgall.htm

Biology and Control of Crown Gall
Information on Agrobacterium tumefaciens which causes rown gall disease on many plants especially members of the rose family such as apple, pear, peach, cherry, almond, raspberry and roses.
http://www.biology.ed.ac.uk/research/groups/jdeacon/microbes/crown.htm

Pewag
Offers snow chains, gear-lifting chains, and drive chains.
http://www.pewag.com

Drives & Drives
Roller Chains, Sprockets, Couplers, Conveyor Chains, Slat Chains, Backstops, Precision Roller Chains, Heavy Series Roller Chains, Straight Sided Plate Chains, Standard Chains, Double Pitch Chains, Mayr Products, India
http://www.ddrives.com

Peerless Chains Company
Tire chains, traction cables or snow chains are manufactured at Peerless Chain. We manufacture chain for retail outlets.
http://www.peerlesschain.com

Kool Key Chains
Mini carabiner style keychains..Key chains and links that clip onto anything.
http://www.geocities.com/koolkeychains/

FLEXON GmbH
Steel flat top chains -chains with straight or special-purpose link plates
http://www.flexon.de/

B & S Chains
B&S Chains specialises in spares to help you maintain your playground to a high standard at affordable prices. All our products conform to BS EN 1176/7., U BOLTS, EYEBOLTS, SLINGS, B&S CHAINS, SWING SEATS, SWING CHAINS, PLAYGROUND SPARES AND EQUIPMENT, Our company specialises in spares to help you maintain your playground to a high standard at affordable prices. All our products conform to BS EN 1176/7. We hold stocks of most items and offer a very prompt service. Should you require a product which is not on our web site or have any queries please contact us on 01384 413088
http://www.bandschains.co.uk/

Traction Tire Chains, LLC
Traction Tire Chains, LLC carry an extensive line of traction, tire chains and cable products.
http://www.tractiontirechains.com/