"Building roads on every square in the city radius of the Colossus will help maximize the trade output. It can also be very helpful to build Copernicus' Observatory in the same city."@en . . "Electricity"@en . "Building roads on every square in the city radius of the Colossus will help maximize the trade output. It can also be very helpful to build Copernicus' Observatory in the same city."@en . . . "Adds +1 trade in any square that already is producing trade in that city."@en . "Bronze Working"@en . "Colossus (Civ1)"@en . . "200"^^ .