merge can only merge two objects at a time- I would like to merge more than
two objects at a time.

s.d <- structure(list(RiverMile = c(202L, 198L, 190L, 185L, 179L, 148L,
119L, 61L)), .Names = "RiverMile", row.names = c(NA, -8L), class =
"data.frame")
#s.d is all of the river miles that can occur in all of the data frames that

I want to put together

feb06 <- structure(list(RiverMile = c(202L, 190L, 185L), X2.1.06 =
c(2850000,
NA, NA)), .Names = c("RiverMile", "X2.1.06"), row.names = c(29L,
31L, 32L), class = "data.frame")

may06 <- structure(list(RiverMile = c(202L, 198L, 190L, 185L, 148L), X5.1.06

= c(NA_real_,
NA_real_, NA_real_, NA_real_, NA_real_)), .Names = c("RiverMile",
"X5.1.06"), row.names = c(29L, 30L, 31L, 32L, 34L), class = "data.frame")

jun06 <- structure(list(RiverMile = c(202L, 198L, 190L, 185L, 148L), X6.1.06
= c(NA_real_,
NA_real_, NA_real_, NA_real_, NA_real_)), .Names = c("RiverMile",
"X6.1.06"), row.names = c(29L, 30L, 31L, 32L, 34L), class = "data.frame")

merge(s.d, feb06, all=T)
  RiverMile X2.1.06
1        61      NA
2       119      NA
3       148      NA
4       179      NA
5       185      NA
6       190      NA
7       198      NA
8       202 2850000

#this is what I want- is there a way to implement this over many data frames

-- 
Let's not spend our time and resources thinking about things that are so
little or so large that all they really do for us is puff us up and make us
feel like gods. We are mammals, and have not exhausted the annoying little
problems of being mammals.

-K. Mullis

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