Columbia subject headings:
Marx, Leo, 1919-2022. Machine in the garden--Congresses.
Nature--Social aspects--United States--Congresses.
Technology--Social aspects--United States--Congresses.
United States--Civilization--Congresses.
Harvard subject headings:
Marx, Leo, 1919- Machine in the garden--Congresses.
Nature--Social aspects--United States--Congresses.
Technology--Social aspects--United States--Congresses.
United States--Civilization--Congresses.
Princeton subject headings:
Marx, Leo, 1919- Machine in the garden--Congresses.
Nature--Social aspects--United States--Congresses.
Technology--Social aspects--United States--Congresses.
United States--Civilization--Congresses.