CA-810: http://www.dol.gov/owcp/dfec/regs/compliance/DFECfolio/CA-810.pdf  This is a handbook for Federal Agency personnel specialists, compensation specialists and supervisors.

FECA 550: http://www.dol.gov/owcp/dfec/regs/compliance/feca550q.htm  This is a Department of Labor Q & A concerning Benefits of the Federal Employees' Compensation Act, (FECA)

ACS/CQS: https://owcpmed.dol.gov/portal/main.do This is OWCP's site, very useful to track information about your claim(s).

AMA (American Medical Association): http://www.ama-assn.org/

Code of Federal Regulations: www.gpoaccess.gov/cfr/
Title 20 Chapter VII; Benefits Review Board, Department of Labor. Includes Part 802; Rules of Practice and Procedure: http://www.access.gpo.gov/nara/cfr/waisidx_11/20cfr802_11.html

Doctors that accept OWCP Claimants: http://www.feddoctor.com/ or 1-855-333-3627

ECAB Decisions by month and year: http://www.dol.gov/ecab/decisions/main.htm  Use this site if you know the ECAB appeal number and date of the decision.

ECAB Decisions search by topic: http://www.dol.gov/appeals/search/search.htm  Use this site to search ECAB decisions by topic. Type in your search terms on the left and check the box for Federal Employee's Compensation Act on the right. You can also use this site to check for decisions involving specific names such as physicians and/or nurses.

FECA Manual part 2: http://www.dol.gov/owcp/dfec/regs/compliance/DFECFolio/FECA-PT2.pdf
FECA Manual part 3: http://www.dol.gov/owcp/dfec/regs/compliance/DFECFolio/FECA-PT3.pdf
FECA Manual part 5: http://www.dol.gov/owcp/dfec/regs/compliance/DFECFolio/FECA-PT5.pdf
A must read for any claimant. These are the 'rules' OWCP must abide by. These Manuals are some of the best knowledge a claimant can have. Parts one and two are the basic FECA Manuals, part 5 covers Benefit payments including schedule awards, health benefits, etc...

FEDERAL REHABILITATION ACT OF 1973: http://www.eeoc.gov/laws/statutes/rehab.cfm

FORMS: http://owcp.dol.acs-inc.com/portal/formsAndLinks.do

ICD-9 CODES: http://www.icd9data.com/2011/Volume1/default.htm
ICD-10 CODES: http://www.icd10data.com/ICD10CM/Codes

Medical Dictionary: http://www.nlm.nih.gov/medlineplus/mplusdictionary.html

Merck Manuals: http://www.merckmanuals.com/home/index.html
These are medical manuals. Every district Office of OWCP is required to have the Merck Manuals in their library for reference. Go to this site and look up your medical condition(s), you may find useful information. You can print out what you need and use it with OWCP. Your physician can also refer to the Merck Manuals or quote them in a narrative report making it harder for OWCP to say no.

Occupational Information: http://www.occupationalinfo.org/onet/ This is part of the O*NET site. This site allows you to search employment projections by occupation and also contains an alphabetical index.

O*NET (formally DOT): http://online.onetcenter.org/
Anyone in Vocational Rehabilitation should be aware of O*NET. Once your rehab counselor identifies a job for you, they must attach a O*NET (or DOT) number to the job. This is the site OWCP uses for job descriptions and physical requirements. Use this site to see what the requirements are and if they match your restrictions. Useful on appeal as well.

Research; Physicians:
SEAK National Directory of IME's: http://www.imenet.com/
American Board of IME's: http://www.abime.org/node/19
Juris Pro Expert Witness Directory: http://www.jurispro.com/category/independent-medical-examinations-i-m-e--s-465/
Verdict Search: http://www.verdictsearch.com/
ALM Experts: http://www.almexperts.com/category/Medical-&-Health/MedExpert/1125838
IME Directory: http://www.independentmedicalexaminer.com/search.asp
IME Directory Resource: http://www.independentmedicalexaminers.com/imedirectory/

Second Opinion Services (MRI, X-Ray, CT scan, Ultra Sound): 

United States Code, (U.S.C.): http://www.gpoaccess.gov/uscode/

USPS Track and Confirm: http://www.usps.com/shipping/trackandconfirm.htm

Vocational Rehabilitation Procedure Manual: http://www.dol.gov/owcp/procedure-manual/rehab.pdf
A must read for anyone in Vocational Rehab, OWCP's 'rules' on the subject.