Spesd and altituds of flight ¢aried with thse demands of field con-itions, 
with tha sxtramsa of epproxizetsly 59 amd 160 mllse per bour of apesad and 10 
and §60 fest of altituds, 
Recording ths Data 
All date wore racordsd by the observer on prapared air field forms. 
During ths 1949 survey, ons plans wes squippad with @ wirs recorder and 
the obesrvsr almply "talked" the data on to the wirs, Later the recording was 
transcrihed‘on regular air field forms. This method proved very sucesssful end 
had many advantages oysr recording the data on papsr. 
Ths Actual Survsy 
In the atkual process of chtalning the data, the pilot would mansuver ths 
plang so that all water arses could bs fully inspected from ths air, and so that 
ths obesrrsre could count end record all ducks and gssse observed, Both ths 
-pllot and obasrver scennsd water araeas, with ths obasrver doing all the rs¢ord- 
fog. Keach flight crew was aquippsd with a est of detailed county maps to assist 
in orientation. 
Tos 19448 survey- was conductsad during thse psriod May 20 to Juns 4, during 
Bhich LO of tha 17 sample strips wars covered. Ths 1949 survay was made during 
the pariod May 9 to June 6, during which all 1? of ths sampls atrins wars 
covered. Tha timing was such that data ig regarded as comparabls for the two 
yrars,. 
Tos Gams Manegement Branch of ths Fisb and Wildlifs Services, ywsing a 100 
hp. Cub Cruiser, made runs 2 and 4 in 1945 and rugs 1 and 2 in 1949. 
The Office of Hivsr Basin Studiss of ths Fish and Wildlifs Servics, using 
a Cegspa.120, mads runs 6 and 9, both im 1948 and 1949. 
Ths Fadaral Aid Divieion of ths North Dakote Gams and Fish Dspartmont, 
using & Piper Cub J-5 and 65 bp. Taylorereft, made runa 12, 13, 14, 15, 14 and 
17 in 1948, and in 1949, using a Luscambs Obaerver, Pipsr Cub, and 65 bp. 
Taylorcraft, meds rune 3, 4, 5, 7, &, 10, 11, 12, 13, 14, 15, "16 and 17. Ths 
Beams personnel from ths thrss sesncisa mads ths surrey both yoars. 
Approximately 9& hours of flying tims wars rsquirsd to complsts ths 1948 
survsy, while tha 1949 suorvsy Br approximately 157 flying hours. Tate 
area shown in Tables l. 
LE5 
