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Mathworld - Golomb Ruler
Description and theory, with references to additional reading.
http://mathworld.wolfram.com/GolombRuler.html
Wolfram.com ~ Site Info Whois Trace Route RBL Check

Distributed.net: Project OGR
Describes the computerized effort to prove that the known shortest Golomb rulers (up to 25 marks) are really the shortest, or else find the actual shortest ones.
http://www.distributed.net/ogr/
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Mathematical Association of America - Math Games: Rulers, Arrays, and Gracefulness
Ed Pegg Jr. writes about the history (and future) of Golomb rulers and related concepts.
http://www.maa.org/editorial/mathgames/mathgames_11_15_04.html
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Modular and Regular Golomb Rulers
Detailed, theoretical tutorial with references.
http://cgm.cs.mcgill.ca/~athens/cs507/Projects/2003/JustinColannino/
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The Search for a Finite Projective Plane of Order 10
By C.W.H. Lam.
http://www.cecm.sfu.ca/organics/papers/lam/paper/html/paper.html
Sfu.ca ~ Site Info Whois Trace Route RBL Check

Orthogonal Arrays
Lists of orthogonal arrays, difference schemes and experimental design tools maintained by Warren F. Kuhfeld.
http://support.sas.com/techsup/technote/ts723.html
Sas.com ~ Site Info Whois Trace Route RBL Check

Golomb Rulers
Table of lengths of shortest known Golomb rulers, counts of optimal and near-optimal rulers, and some Fortran programs for dealing with Golomb rulers.
http://researchweb.watson.ibm.com/people/s/shearer/grule.html
Ibm.com ~ Site Info Whois Trace Route RBL Check

Golomb Rulers
Specification of the problem, research report, references, a solver program and some results.
http://www.cs.st-andrews.ac.uk/~ianm/CSPLib/prob/prob006/
St-andrews.ac.uk ~ Site Info Whois Trace Route RBL Check