http://www.warwickshirerailways.com/lms/waterortonwalsall.htm
http://www.railaroundbirmingham.co.uk/Stations/sutton_park.php
http://www.suttoncoldfieldatoz.com/index.html
http://www.fospa.org.uk/47ad.html
http://www.mikekemble.com/sutton/park1.html
http://postalheritage.org.uk/
http://www.popularflying.com/Covers/01
http://newsgroups.derkeiler.com/Archive/Rec/rec.collecting.stamps.discuss/2007-10/msg00609.html
http://www.americanairmailsociety.org/
http://www.actlab.utexas.edu/emma/
http://en.wikipedia.org/wiki/Airmail_etiquette
http://www.midlandrailwaystudycentre.org.uk/
http://webp.mimas.ac.uk/~zzaascs/mrsoc/mrsoc.html
http://www.ukmodelshops.co.uk/SCRS/index.html
http://loco-park.blogspot.com/
http://ww2.letters.ie/
http://www.bbc.co.uk/northernireland/yourplaceandmine/topics/war/v_mail.shtml
http://library.duke.edu/digitalcollections/adaccess/vmail.html
http://www.postalmuseum.si.edu/research/index.html#resources
http://www.militaryphs.org/
