What We Do Ark Magazine The ARK is our membership magazine, below are some past copies. As part of your RBST membership you will receive this on a quarterly basis. If you are interested in joining RBST please click here. Ark Winter 2021 Ark Spring 2021 Ark Winter 2020 Ark Spring 2020 Ark Summer 2020 Ark Autumn 2020 Ark Winter 2019 Ark Spring 2019 Ark Summer 2019 Ark Autumn 2019 Ark Winter 2018 Ark Spring 2018 Ark Summer 2018 Ark Autumn 2018 Ark Winter 2017 Ark Spring 2017 Ark Summer 2017 Ark Autumn 2017