Pluto's diameter in 1950 by Gerard Kuiper,(6,400 km).

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Pluto's diameter in 1950 by Gerard Kuiper, using the 200-inch (505-cm) Hale telescope, gave a figure of under 4,000 miles (6,400 km).
Pluto's diameter to be close to 4000 km unusually large and close Kuiper belt object
Smoluchowski, Roman. The Solar System. New York: Scientific American Books, 1983: 120. "It's size is very difficult to establish, at present is 4000 km." 4000 km
Based speckle interferometry specified Pluto's diameter to be close to 4000 km (i.e., 1.15 that of our Moon); leading to a bulk density of only 0.5 g/ cm3 (cf. Bonneau and Foy, 1980). More exact data on the Uranian and Neptunian satellites
Planets X and Pluto reasonable and typical estimate of the albedo, a diameter between 4,000 and 6,000 km is indicated,It would thus appear that taking Pluto's diameter to be about 5,500 km cannot be far wrong.
More recently, Halliday has placed an upper limit of 6400 km on the diameter of Pluto from a near occultation of a 15th ... a diameter of 7200 km (4500 miles) for Pluto, whilst if Hall iday's upper limit for the diameter of 6400 km (4000 miles)
Explanation of Physical characteristics of Pluto
ALBEDO NO EQUAL A MASS it becomes less emissive by an equal amount 
such that for every 16 KBOs found of a given diameter D, 1 should have diameter 2D. Thus, of these 10 very large (D > 1000 km KBOs), C- 1 should have a diameter approaching that of Pluto, with D ~ 2000 km. ... A 2500 km diameter body with 10% albedo at 100 AU would be detectable near our magnitude limit, as would a 4000 km diameter body with 4% albedo at 100 AU.
Discovering the Universe with bestselling brief text for descriptive astronomy 
Pluto below the boundary. But why not 4,000 km or 6,000 km? This criterion is completely subjective and provides nothing meaningful in terms of physics . For comparison, our Sun's closest star (Proxima Centauri) is 4.2 light-years away, or 4,000 times the diameter of our solar system measured at Pluto's orbit. The distance of the Moon from the Earth was found to be about 60 times the Earth's radius
source books
Sun and Planetary System 2012 Pluto's diameter to be close to 4000 km
The new Encyclopaedia Britannica: in 30 vol - Volume 1 1974 diameter between 4,000 and 6,000
Planets X and Pluto - Page 244 1980 Taking 4,000 miles (6450 km) as an upper limit for Pluto's diameter
New Scientist - 2 Oct 1980 They measure Pluto to be 4000 km across and Charon's diameter to be 2000 km.
Planetarium 1969 . a diameter of 7200 km (4500 miles) for Pluto
Kumbha Mela: History and Religion 1993 It is suggested that with a diameter in the range of 4000 km., Pluto must have a mean density close
The Illustrated encyclopedia of astronomy and space 1980 Pluto's diameter in 1950 by Gerard Kuiper, using the 200-inch (505-cm) Hale telescope, gave a figure of under 4,000 miles (6,400 km).

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