To get this information I have to look up 1 and the other. I have obtained information not only through people (see the Thank You – page), but also through books, magazines and websites. Below is a small overview of literature that I definitely find worth:

Literature:

BOOKAUTORPUBLISHER - YEARISBNWHERE FOR SALE?
Commander MOORS/ - 1927 ???Second hand shops (ex: www.Delcampe.net)
P. DELAMEILLIEUREEUROPESE BIBLIOTHEEK - 1972/Second hand shops (ex: www.Delcampe.net)
H. JAMAREUROPESE BIBLIOTHEEK - 1973Second hand shops (ex: www.Delcampe.net)
SYLVAIN WEUTS / - 1985/Museum of Camp Beverlo | Second hand shops (ex: www.Delcampe.net)
// - 1985/Museum of Camp Beverlo
/FARMAPRINT LEOPOLDSBURG - 1999/Second hand shops (ex: www.Delcampe.net)
LUC DE VOS
FRANKY BOSTYN
BERND VANDERHEYDEN
DAVIDSFONDS UITGEVERIJ - 2014978-90-5908-620-3Tourist Office Leopoldsburg & Better Bookshop
HEEMKUNDIGE KRING HEPPEN/ - 2014/HEEMKUNDIGE KRING HEPPEN (Historial Society Heppen)
WIM DE RIDDERTSP EDITIES - 2016/P.F.T - T.S.P.

Websites:

Website

Short explanation+ Link

Ars Moriendi

The website of Ars Moriendi contains a big collection of photos, death cards, obituaries and much more of prominent figures from Belgian history from 1830 to the present.

Link: Ars Moriendi

Inventaris Onroerend Erfgoed

The 'Inventaris van het onroerend erfgoed' (Inventory of the immovable heritage) offers you an overview of valuable heritage in Flanders. Architectural, archaeological, landscape and sailing heritage are included in this database, accounting for more than 83,000 heritage objects in total.
Link: Inventaris Onroerend Erfgoed

MOLENEcho's

The database of existing and disapperared mills of Belgium.

Link: MolenEchos

The Belgian Army

The Belgian Army from 1830 - 1914. Interesting site, with information about the Belgian War Cemetery amongst others.

Link: ABL 1830-1914

Magazines:

TIJDSCHRIFTPUBLISHED BYAPPEARSAVAILABLE VIA
ERFGOEDKRING LEOPOLDSBURGQUARTERLY (momentarely it is temporary not being published)Erfgoedkring Leopoldsburg vzw
Hechtelsesteenweg 7 box 1, 3970 Leopoldsburg
erfgoedleopoldsburg@gmail.com
HEEMKRING HEPPENTHREE TIMES A YEARHeemkundige Kring Heppen
P/a Frankendijk 27, 3971 Heppen
andycaerts@me.com - gustcaelen@telenet.be
MUSEUM CAMP BEVERLOFOUR MONTHLYMuseum Kamp van Beverlo vzw
museumkvb@skynet.be