Petr Marsal:
A walk through the valley of the Roklanský stream
Petr Marsal:
An undemanding walk through the valley of the Modrava stream towards the border of Luzenské Valley
Petr Marsal:
Effect of a bark-beetle (Scolytidae) from Sumava
Petr Marsal:
Pine bark beetle (Pityogenes chalcographus)
Petr Marsal:
Bark Beetle Calamity in the Sumava National Park in the Czech Republic
Petr Marsal:
Bark beetle causes at Sumava, the largest national park in the Czech Republic
Petr Marsal:
Sheeps