A Diatom - Obs. by Year - Montana Field Guide

*Excludes Observations that spanned multiple years

Total	955
Pre 1970	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	3
1996	2
1997	0
1998	1
1999	6
2000	20
2001	58
2002	32
2003	128
2004	153
2005	85
2006	37
2007	32
2008	31
2009	39
2010	48
2011	34
2012	67
2013	29
2014	33
2015	44
2016	31
2017	32
2018	10
2019	0
2020	0
2021	0
2022	0
2023	0
2024	0
2025	0