Columbia subject headings:
Harvard subject headings:
Medical care--Colombia--Antioquia.
Medicine--Colombia--Antioquia--History.
Medicine--Practice--Colombia--Antioquia.
Railroad construction workers--Diseases--Colombia--Antioquia--History.
Railroad construction workers--Health and hygiene--Colombia--Antioquia--History.
Railroad construction workers--Medical care--Colombia--Antioquia--History.
Railroads--Colombia--Antioquia--Employees.
Railroads--Health aspects--Colombia--Antioquia--History.
Princeton subject headings:
Medicine--Colombia--Antioquia--History.
Railroad construction workers--Diseases--Colombia--Antioquia--History.
Railroad construction workers--Health and hygiene--Colombia--Antioquia--History.
Railroad construction workers--Medical care--Colombia--Antioquia--History.
Railroads--Health aspects--Colombia--Antioquia--History.