Boitlhakiso Tlhaloso:
Tloso ea Amalgam e Sireletsehileng, Phekolo ea Oksijene ea Ozone, Ts'ehetso ea Phepo e nepahetseng
Tloso ea Amalgam e Sireletsehileng, Phekolo ea Oksijene ea Ozone, Ts'ehetso ea Phepo e nepahetseng