Be careful combining search terms... not every item has all of the fields filled in. For instance "Decade 1960's" "Year 1962" will fail the search if we did not know the exact year of the item. Start with a basic "Type" search, then see if you can refine it with a further detail.
Buildings that have disappeared or changed substantially can be found by entering Historical into the keywords.
The decade is specified by the start year, that is the "50's" is entered as "1950"
You can Exclude Plaques, Cabin Photos and/or CAMP radio from the results, if you have not chosen that particular type.