It may be written somewhere else, but all the same : it is worth repeating it.
The Hunebedden have been systematically surveyed and restored by Pr. A van Giffen (1884-1973), and catalogued in his essential book : De hunebedden in Nederland, 1925, vol.1 Text, vol.2 Atlas.
Most of them are in the Province Drenthe, a few (2) in Province Groningen ; one more was later added in the Province Utrecht.
Pr. van Giffen numbered them by province, globally from North to South. Hence the numbers D1 to D54, G1 and G5 and U1.
Of which the few surviving boulders of D33 have been used to supplement D49 ; D48 is no longer listed as hunebed ; G2 to G4 have also been dropped out the list.
Something is not right. This message is just to keep things from messing up down the road