The Bluebird Rail Data

<i>I combed through as many issues of The Bluebird (the publication of the Audubon Society of Missouri for all records of Sora, Virginia Rail, Yellow Rail, King Rail and Black Rail. Those data are included here. <br><br>http://mobirds.org/ASM/Bluebird.aspx</i><i><br></i><i>species = the four letter alpha code for each species</i><i>year = the year the observation happened</i><i>month = the month the observation happened</i><i>day = the day the observation happened</i><i>location = the location as described in The Bluebird</i><i>county = if given, the county the observation was in</i><i>number = number of individuals, if count not given, entered a 1</i><i>volume = volume of The Bluebird</i><i>issue = issue of The Bluebird </i>

我全面检索了《蓝鸟》（The Bluebird，密苏里奥杜邦协会（Audubon Society of Missouri）的官方出版物）的全部刊期，从中提取了所有关于斑胸田鸡（Sora）、弗吉尼亚秧鸡（Virginia Rail）、黄秧鸡（Yellow Rail）、王秧鸡（King Rail）以及黑秧鸡（Black Rail）的观测记录，并将这些数据收录于本数据集。
数据来源链接：http://mobirds.org/ASM/Bluebird.aspx
species = 各物种对应的四位字母代码
year = 该次观测发生的年份
month = 该次观测发生的月份
day = 该次观测发生的具体日期
location = 《蓝鸟》期刊中记载的观测点位描述
county = 若期刊中提供了观测所在县份，则填写对应县名
number = 观测个体总数，若未给出具体数量，则默认记为1
volume = 《蓝鸟》的刊载卷次
issue = 《蓝鸟》的具体刊期