How to find naturalization records and passenger records
I have been trying, for a long time, to find out more about my 2nd GGfather, Christian Andersen LZZH-RR9 and when he came into the country. I am not having much luck because he disappeared between the 1870 Census and the 1880 Census, because his name is so common etc. (I have not found a death record either.) Therefore, I have been looking for records of his children. I have found a lot more on Fritz Marinius Christiansen (Anderson in the US) KDWJ-YP3. This record is him, because he is on the same street as on the 1880 Census: https://www.familysearch.org/ark:/61903/3:1:33S7-9TW9-NKV
That one led me to this one: https://www.familysearch.org/ark:/61903/3:1:33S7-9PQ7-7ZDY?i=237&personaUrl=%2Fark%3A%2F61903%2F1%3A1%3AXKL8-37R I don't know if this will lead me to anything about the family's immigration, because it isn't listed on this index, but I would like to find the actual record that this index is for. How do I find Vol. 4? I don't know what that is referring to. I also don't know what the Minor 5 years is referring to, because he was 29 in 1880 according to the first record. Maybe that he was a minor 5 years previous to this in 1870, at age 19?
I have not found anything useful for the oldest brother, Oscar Christian Christiansen L4BC-GGS or my great grandmother, Marie Christiane Christiansdatter L4BC-GTT or the other women. Am I correct that you don't find naturalization records for women in the 1870s or 1880s?
Any suggestions as to where to go from here would be greatly appreciated.