American Institute of Timber Construction
Representing the glued laminated timber industry since 1952, AITC provides technical support to manufacturers and design communities.
http://www.aitc-glulam.org/

Universal Timber Structures, Inc.
National timber specialist in heavy timber and glulam structure design, engineering, fabrication and construction
http://www.utsdesign.com/

Timber Systems
Timber Systems, in Lapeer Michigan, has been designing, manufacturing and distributing wood structures since 1975.
http://www.timbersystems.com/

Unadilla Laminated Products
Manufacturers of long architectural laminated wood beams, timber bridges, structural gluelams, heavy trusses and custom lumber arches.
http://www.unalam.com/

Timber Restoration, Inc.
Timber Restoration, Inc., a New Jersey based contractor, specializes in state of the art repairs to structural wood framing systems, roof trusses, arches and domes, including glued laminated (glulam), mechanically laminated wood beams and solid-sawn wood beams. Epoxy injection repairs. Structural inspections, repairs, and erection of wood structures. Bowstring and other truss configurations, glued laminated wood arches and structural columns.
http://www.timberrestoration.com/

Catawissa Lumber and Specialty Co., Inc.
Produces and Distributes quality dimensional hardwood and panels for the lumber, kitchin, building and furniture industry
http://www.catlmbr.com/

Timberbond Industries Ltd
N.Z. supplier of glue laminated timber.
http://www.timberbond.co.nz/

Kretz Lumber Co., Inc.
Kretz Lumber
http://www.kretzlumber.com/

Timber Frame Services
Producer of trussed rafters and laminated beams. Based in Shropshire, England.
http://www.timberframe.co.uk/

Timber Trade Federation
Trade association for the timber industry and timber companies, arguing the case for timber products as the only truly renewable building resource.
http://www.ttf.co.uk/