Columbia subject headings:
Hemocyanin--Congresses.
Hemoglobin--Congresses.
Invertebrates--Physiology--Congresses.
Oxygen--Physiological transport--Congresses.
Harvard subject headings:
Princeton subject headings:
Hemocyanin--Congresses.
Hemoglobin--Congresses.
Invertebrates--Physiology--Congresses.
Oxygen--Physiological transport--Congresses.