boilers 8 [vynechat] heaters 8 [vynechat] vykurovacie zariadenia 8 [vynechat] kotly 7 [vynechat] dejiny 2 [vynechat] history 2 [vynechat] railroads 2 [vynechat] železnice 2 [vynechat] aerial photography 1 [vynechat] branná povinnosť 1 [vynechat] business enterprises 1 [vynechat] description and travel 1 [vynechat] heating 1 [vynechat] heating elements 1 [vynechat] industries 1 [vynechat] kotle 1 [vynechat] letecká fotografia 1 [vynechat] liability for military service 1 [vynechat] lost monuments 1 [vynechat] obyvateľstvo 1 [vynechat] opevnenie Česko-Slovenska, 1935-1938 1 [vynechat] pevnosti 1 [vynechat] podniky 1 [vynechat] population 1 [vynechat] priemysel 1 [vynechat] railroad lines 1 [vynechat] railroad stations 1 [vynechat] spoločnosť a politika 1 [vynechat] strechy 1 [vynechat] sudcovia 1 [vynechat]