freely available for download in a variety of formats from Science History Institute Digital Collections at digital.sciencehistory.org Pictures of Siemennowicz designs Short bio and 20th century picture on Uranos.org Short bio and few pictures Generals of the Polish–Lithuanian Commonwealth 1600s births 1650s deaths 17th-century Lithuanian nobility People from Raseiniai District Municipality Lithuanian scientists Polish scientists Belarusian scientists Polish engineers Lithuanian engineers Belarusian engineers Polish inventors Lithuanian inventors Belarusian inventors Polish military writers Rocket artillery Early rocketry Early spaceflight scientists Rocket scientists Vilnius University alumni Clan of Ostoja