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