"Helsinki." . . "kasvit." . . . . . . . . . . . . "Let's explore nature in Helsinki ; written and compiled by Matti Nieminen (editor in chief) and Eero Haapanen ; photographs: Arto Nironen ... [et al.] ; translation: Peter Joy ... ; expert consultants: Kalevi Hiironniemi ... [et al.]" . "Let's explore nature in Helsinki"@en . . . . . . "retkeily." . . "matkaoppaat." . . "Helsingin kaupunki. Ympäristökeskus." . . . . "eläimet." . . "luonto." . . "oppaat." . .