The 1934 National Parks Issue
(read how to value your stamp below)
You have the National Park issue from the year 1934. The 3c value is quite common.
The perforated variety (Scotts #742) value can be found by clicking here.
The imperforated variety (Scotts #758) value can be found by clicking here.
The souvenir sheet's (Scotts #751) value can be found by cclicking here. Or Scotts #769 which looks exactly the same but has a wide gutter between each souvenir sheet and its adjacent souvenir sheet. Number 770 can be located by clicking here.
#769 showing wide gutter between blocks