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Prenatal Diagnosis|January 1, 1993
Early genetic amniocentesis--4 years' experienceS Kerber, K R HeldPrenatal Diagnosis|May 1, 1984
The effect of oxygen tension on colony formation and cell proliferation of amniotic fluid cells in vitroK R Held, S SönnichsenScience (New York, N.Y.)|October 15, 1971
Color- and edge-sensitive channels in the human visual system: tuning for orientationR Held, S R ShattuckInvestigative Ophthalmology & Visual Science|August 1, 1983
The development of binocular summation in human infantsE E Birch, R HeldVision Research|January 1, 1982
The postnatal development of monocular optokinetic nystagmus in infantsJ R Naegele, R HeldJournal of Pharmaceutical Sciences|November 1, 1980
Binding of toxic metabolites of isoniazid by aconiazideH R Held, S LandiThe American Review of Respiratory Disease|January 1, 1975
Effect of light on tuberculin purified protein derivative solutionsS Landi, H R HeldDevelopments in Biological Standardization|January 1, 1986
Effect of oxidation on the stability of tuberculin purified protein derivative (PPD)S Landi, H R HeldDevelopments in Biological Standardization|January 1, 1986
The need to redefine the unit of the international standard for tuberculin purified protein derivative (PPD-S)S Landi, H R HeldVision Research|January 1, 1983
Shared characteristics of stereopsis and the purely binocular processJ M Wolfe, R HeldPageof 39