11 1793-1835 6 antiquities apeldoorn bronzeage casparjacobchristiaan cherniakhivculture congresses denmark earthworks(archaeology) eurasia excavations(archaeology) frankfurtammain germany heathlands hopewellculture hügelgrab indiansofnorthamerica ironage jutland mississippianculture mound-builders netherlands newark ohio palynology paläobotanik reuvens scandinavia skelhøjsite wisconsin