From Holland Tourism site
(go to Tulips, windmills and more* >*Culture* >*Bicycling* >*Maps* >*Bicycling maps):
"Before you hop on a bike in Holland, it is a good idea to buy a cycling map. The smallest country roads and lanes, cycling tracks and villages are indicated on the combined cycle- and road maps.
The ANWB/VVV (Tourist Information Office) sells bicycling maps. They are available for every province in Holland. Very useful, for instance, if you want to plan your own route or want to know where you are, once you have reached an unplanned destination. With a good, detailed cycling map the possibilities are endless.
’FIETSIDEEËNKAART’ (BICYCLE INSPIRATION MAP)
Possibilities for touring cyclists are growing every year. The ‘Fietsideeënkaart’ is a useful reference tool. You can find ideas for a bicycle trip or vacation in the overview map of Holland and in the suggestion section. The ‘Fietsideeënkaart’ can be obtained at the local tourist offices (VVV's)."
Belgium for Biking
, (a page of the main Belgium tourist site) seems to focus mainly on commercial tour operators. There is a poorly scaled map of routes on this page however. They also state: "Local Tourist Offices in Belgium provide Information on biking routes." Seems a bit vague...
(bike info page). Note the nice national bike route page. Seems you can order map sets through them. I'd think one could overlay a detailed Michelan map just from the web site (say link Village to Village)-with stops at tourist information along the way for detailed info (historical/cultural/natural) of sites to see. [Similar would seem to apply for Belgium above, and Italy bellow.]
From Italian Tourism
page-seems a national cycling route network is in progress. Bicitalia
, currently only in italian.
--Sorry for the long post. Again, seems you could buy (or xerox) bits of a detailed map for the countries you would like to cycle through(cheapest option). Then stop and chat with folks at various Tourist informations along the way--(and its another nice way to meet more folks as well).
Surely there are commercial mapped route guides available for the individual countries (the Lonely Planet cycling France comes to mind). I personally, would not want to carry them all-copied sections perhaps.